The treatment of obsessive‐compulsive checking: A randomised trial comparing danger ideation reduction therapy with exposure and response prevention

References

• Aboujaoude, E., Barry, J. J., & Gamel, N. (2009). Memantine augmentation in treatment‐resistant obsessive‐compulsive disorder: An open‐label trial. Journal of Clinical Psychopharmacology, 29, 51–55. doi: https://doi.org/10.1097/JCP.0b013e318192e9a4
   PubMed Web of Science ®Google Scholar
• Abramowitz, J., Franklin, M. E., & Foa, E. B. (2002). Empirical status of cognitive behavioral therapy for obsessive compulsive disorder. Romanian Journal of Cognitive Behavioral Therapies, 2, 89–104.
   Google Scholar
• Abramowitz, J. S., & Foa, E. B. (2000). Does comorbid major depressive disorder influence outcome of exposure and response prevention for OCD? Behavior Therapy, 31, 795–800. doi: https://doi.org/10.1016/S0005‐7894(00)80045‐3
   Web of Science ®Google Scholar
• Abramowitz, J. S., Tolin, D. F., & Diefenbach, G. J. (2005). Measuring change in OCD: Sensitivity of the obsessive‐compulsive inventory‐revised. Journal of Psychopathology and Behavioral Assessment, 27, 317–324. doi: https://doi.org/10.1007/s10862‐005‐2411‐y
   Web of Science ®Google Scholar
• Alcolado, G. M., & Radomsky, A. S. (2011). Believe in yourself: Manipulating beliefs about memory causes checking. Behaviour Research and Therapy, 49, 42–49. doi: https://doi.org/10.1016/j.brat.2010.10.001
   PubMed Web of Science ®Google Scholar
• American Psychiatric Association (2000). Diagnostic and statistical manual of mental disorders (4th ed. text rev). Washington, DC: APA. doi: https://doi.org/10.1176/appi.books.9780890423349.
   Google Scholar
• Andrews, G., Crino, R., Lampe, L., Hunt, C., & Page, A. (2002). The treatment of anxiety disorders. Clinician's guide and patients manuals (2nd ed.). New York: Cambridge University Press.
   Google Scholar
• Arrindell, W. A., de Vlaming, I. H., Eisenhardt, B. M., van Berkum, D. E., & Kwee, M. G. (2002). Cross‐cultural validity of the Yale‐Brown Obsessive Compulsive Scale. Journal of Behavior Therapy and Experimental Psychiatry, 33(3–4), 159–176.
   Web of Science ®Google Scholar
• Ball, S. G., Baer, L., & Otto, M. W. (1996). Symptom subtypes of obsessive‐compulsive disorder in behavioral treatment studies: A quantitative review. Behaviour Research and Therapy, 34, 47–51.
   PubMed Web of Science ®Google Scholar
• Beck, A. T., Steer, R. A., Ball, R., & Ranieri, W. F. (1996). Comparison of the Beck Depression Inventories‐IA and ‐II in psychiatric outpatients. Journal of Personality Assessment, 67, 588–797. doi: https://doi.org/10.1207/s15327752jpa6703_13. PMID 8991972.
   PubMed Web of Science ®Google Scholar
• Beck, A. T., Steer, R. A., & Brown, G. K. (1996). Beck depression inventory—Second edition manual. San Antonio, TX: The Psychological Corporation.
   Google Scholar
• Becker, B. J. (1988). Synthesizing standardized mean‐change measures. British Journal of Mathematical and Statistical Psychology, 41, 257–278. doi: https://doi.org/10.1111/j.2044‐8317.1988.tb00901.x
   Web of Science ®Google Scholar
• Belloch, A., Cabedo, E., & Carrió, C. (2008). Cognitive versus behaviour therapy in the individual treatment of obsessive‐compulsive disorder: Changes in cognitions and clinically significant outcomes at post‐treatment and one‐year follow‐up. Behavioural and Cognitive Psychotherapy, 36, 521–540. doi: https://doi.org/10.1017/JCP.0b013e318192e9a4
   Web of Science ®Google Scholar
• Bobes, J., Gonzalez, M. P., Bascaran, M. T., Arango, C., Saiz, P. A., & Bousno, M. (2001). Quality of life and disability in patients with obsessive‐compulsive disorder. European Psychiatry, 16, 239–245.
   PubMed Web of Science ®Google Scholar
• Borkovec, T. D., & Nau, S. D. (1972). Credibility of analogue therapy rationales. Journal of Behaviour Therapy and Experimental Psychiatry, 3, 257–260.
   Web of Science ®Google Scholar
• Borkovec, T. D., Newman, M. G., Pincus, A. L., & Lytle, R. (2002). A component analysis of cognitive‐behavioral therapy for generalized anxiety disorder and the role of interpersonal problems. Journal of Consulting & Clinical Psychology, 70, 288–298. doi: https://doi.org/10.1037/0022‐006X.70.2.288
   PubMed Web of Science ®Google Scholar
• Braga, D. T., Cordioli, A. V., Niederauer, K., & Manfro, G. G. (2005). Cognitive‐behavioral group therapy for obsessive‐compulsive disorder: A 1‐year follow‐up. Acta Psychiatrica Scandinavia, 112, 180–186. doi: https://doi.org/10.1111/j.1600‐0447.2005.00559.x
   PubMed Web of Science ®Google Scholar
• Braga, D. T., Manfro, G. G., Niederauer, K., & Cordioli, A. V. (2010). Full remission and relapse of obsessive‐compulsive symptoms after cognitive‐behavioral group therapy: A two‐year follow‐up. Revista Brasileira de Psiquiatria, 32, 164–168.
   PubMed Web of Science ®Google Scholar
• Burns, G. L., Keortge, S. G., Formea, G. M., & Sternberger, L. G. (1996). Revision of the Padua inventory of obsessive compulsive disorder symptoms: Distinctions between worry, obsessions, and compulsions. Behaviour Research and Therapy, 34, 163–173.
   PubMed Web of Science ®Google Scholar
• Christensen, H., Hadzi‐pavlovic, D., Andrews, G., & Mattick, R. (1987). Behavior therapy and tricyclic medication in the treatment of obsessive‐compulsive disorder: A quantitative review. Journal of Consulting and Clinical Psychology, 55, 701–711.
   PubMed Web of Science ®Google Scholar
• Cohen, J. (1988). Statistical power analysis for the behavioral sciences (2nd ed.). Hillsdale, NJ: Lawrence Erlbaum Associates.
   Google Scholar
• Cottraux, J., Note, I., Yao, S. N., Lafont, S., Note, B., Mollard, E., … Dartigues, J. F. (2001). A randomized controlled trial of cognitive therapy versus intensive behavior therapy in obsessive‐compulsive disorder. Psychotherapy and Psychosomatics, 70, 288–297. doi: https://doi.org/10.1159/000056269
   PubMed Web of Science ®Google Scholar
• Crino, R., Slade, T., & Andrews, G. (2005). The changing prevalence and severity of obsessive‐compulsive disorder criteria from DSM‐III to DSM‐IV. American Journal of Psychiatry, 162, 876–882. doi: https://doi.org/10.1176/appi.ajp.162.5.876
   PubMed Web of Science ®Google Scholar
• Dallal, G. E. (1997). Randomization.com [Computer software]. Retrieved from http://www.randomization.com
   Google Scholar
• Deacon, B. J., & Abramowitz, J. S. (2005). The Yale‐Brown Obsessive Compulsive Scale: Factor analysis, construct validity, and suggestions for refinement. Journal of Anxiety Disorders, 19, 573–585. doi: https://doi.org/10.1016/j.janxdis.2004.04.009
   PubMed Web of Science ®Google Scholar
• Dougherty, D. D., Rauch, S. L., & Jenike, M. A. (2004). Pharmacotherapy for obsessive‐compulsive disorder. Journal of Clinical Psychology, 60, 1195–1202. doi: https://doi.org/10.1002/jclp.20083
   PubMed Web of Science ®Google Scholar
• Drummond, L. M., Pillay, A., Kolb, P., & Rani, S. (2007). Specialised in‐patient treatmentfor severe, chronic, resistant obsessive‐compulsive disorder. The Psychiatrist, 31, 49–52. doi: https://doi.org/10.1192/pb.bp.105.007609
   Google Scholar
• Eddy, K. T., Dutra, L., Bradley, R., & Westen, D. (2004). A multidimensional meta‐analysis of psychotherapy and pharmacotherapy for obsessive‐compulsive disorder. Clinical Psychology Review, 24, 1011–1030. doi: https://doi.org/10.1016/j.cpr.2004.08.004
   PubMed Web of Science ®Google Scholar
• Emmelkamp, P. M. G., van Oppen, P., & van Balkom, A. J. L. M. (2002). Cognitive changes in patients with obsessive‐compulsive rituals treated with exposure in vivo and response prevention. In R. O. Frost & G. Steketee (Eds.), Cognitive approaches to obsessions and compulsions: Theory, assessment, and treatment (pp. 391–401). Oxford: Pergamon.
   Google Scholar
• Emmelkamp, P. M. G., Visser, S., & Hoekstra, R. J. (1988). Cognitive therapy vs. exposure in vivo in the treatment of obsessive‐compulsives. Cognitive Therapy & Research, 12, 103–114.
   Web of Science ®Google Scholar
• Fisher, P. L., & Wells, A. (2005). How effective are cognitive and behavioral treatments for obsessive–compulsive disorder? A clinical significance analysis. Behaviour Research and Therapy, 43, 1543–1558. doi: https://doi.org/10.1016/j.brat.2004.11.007
   PubMed Web of Science ®Google Scholar
• Foa, E., Kozak, M. J., Salkovskis, P. M., Coles, M. E., & Amir, N. (1998). The validation of a new obsessive‐compulsive disorder scale: The Obsessive Compulsive Inventory. Psychological Assessment, 10, 206–214.
   Web of Science ®Google Scholar
• Foa, E. B., Huppert, J. D., Leiberg, S., Langner, R., Kichic, R., Hajcak, G., & Salkovskis, P. M. (2002). The Obsessive–compulsive Inventory: Development and validation of a short version. Psychological Assessment, 14, 485–495.
   PubMed Web of Science ®Google Scholar
• Foa, E. B., Liebowitz, M. R., Kozak, M. J., Davies, S., Campeas, R., Franklin, M. E., … Tu, X. (2005). Randomized, placebo‐controlled trial of exposure and ritual prevention, clomipramine, and their combination in the treatment of obsessive–compulsive disorder. American Journal of Psychiatry, 162, 151–161. doi: https://doi.org/10.1176/appi.ajp.162.1.151
   PubMed Web of Science ®Google Scholar
• Foa, E. B., Steketee, G., Grayson, J. B., Turner, R. M., & Latimer, P. (1984). Deliberate exposure and blocking of obsessive‐compulsive rituals: Immediate and long‐term effects. Behavior Therapy, 15, 450–472.
   Web of Science ®Google Scholar
• Fontenelle, I. S., Fontenelle, L. F., Borges, M. C., Prazeres, A. M., Rangé, B. P., Mendlowicz, M. V., & Versiani, M. (2010). Quality of life and symptom dimensions of patients with obsessive‐compulsive disorder. Psychiatry Research, 30(179), 198–203. doi: https://doi.org/10.1016/j.psychres.2009.04.00
   Google Scholar
• Franklin, M. E., & Foa, E. B. (2011). Treatment of obsessive compulsive disorder. Annual Review of Clinical Psychology, 7, 229–243. doi: https://doi.org/10.1146/annurev‐clinpsy‐032210‐104533
   Web of Science ®Google Scholar
• Freeston, M. H., Ladouceur, R., Gagnon, E., Thibodeau, N., Rheáume, J., Letarte, H., & Bujold, A. (1997). Cognitive behavioral treatment of obsessive thoughts: A controlled study. Journal of Consulting and Clinical Psychology, 65, 405–413.
   PubMed Web of Science ®Google Scholar
• Frost, R. O., Steketee, G., Krause, M. S., & Trepanier, K. L. (1995). The relationship of the Yale‐Brown Obsessive Compulsive Scale to other measures of obsessive‐compulsive symptoms in a non‐clinical population. Journal of Personality Assessment, 65, 158–168. doi: https://doi.org/10.1207/s15327752jpa6501_12
   PubMed Web of Science ®Google Scholar
• Goodman, W. K., Price, L. H., Rasmussen, S. A., Mazure, C., Delgado, P., Heninger, G. R., & Charney, D. S. (1989a). The Yale‐Brown Obsessive Compulsive Scale. II. Validity. Archives of General Psychiatry, 46, 1012–1016.
   PubMed Web of Science ®Google Scholar
• Goodman, W. K., Price, L. H., Rasmussen, S. A., Mazure, C., Fleischmann, R. L., Hill, C. L., … Charney, D. S. (1989b). The Yale‐Brown Obsessive Compulsive Scale. I. Development, use, and reliability. Archives of General Psychiatry, 46, 1006–1011.
   PubMed Web of Science ®Google Scholar
• Grabill, K., Merlo, L., Duke, D., Harford, K.‐L., Keeley, M. L., Geffken, G. R., & Storch, E. A. (2008). Assessment of obsessive–compulsive disorder: A review. Journal of Anxiety Disorders, 22, 1–17. doi: https://doi.org/10.1016/j.janxdis.2007.01.012
   PubMed Web of Science ®Google Scholar
• Hermans, D., Martens, K., De cort, K., Pieters, G., & Eelen, P. (2003). Reality monitoring and metacognitive beliefs related to cognitive confidence in obsessive‐compulsive disorder. Behaviour Research and Therapy, 41, 383–401.
   PubMed Web of Science ®Google Scholar
• Hollander, E., Kwon, J. H., Stein, D. J., Broatch, J., Rowland, C. T., & Himelein, C. A. (1996). Obsessive‐compulsive and spectrum disorders: Overview and quality of life issues. Journal of Clinical Psychiatry, 57(Suppl 8), 3–6.
   PubMedGoogle Scholar
• Jacobson, N. S., & Truax, P. (1991). Clinical significance: A statistical approach to defining meaningful change in psychotherapy research. Journal of Consulting and Clinical Psychology, 59, 12–19.
   PubMed Web of Science ®Google Scholar
• John, A. L. (1999). Statistical principles for clinical trials (ICH E9): An introductory note on an international guideline. Statistics in Medicine, 18, 1903–1942. doi: https://doi.org/10.1002/(SICI)1097‐0258(19990815)18:15<1903:AID‐SIM188>3.0.CO;2‐F
   Web of Science ®Google Scholar
• Jones, M. K., & Menzies, R. G. (1997). Danger Ideation Reduction Therapy (DIRT): Preliminary findings with three obsessive‐compulsive washers. Behaviour Research and Therapy, 35, 955–960.
   Web of Science ®Google Scholar
• Jones, M. K., & Menzies, R. G. (1998). Danger ideation reduction therapy (DIRT) for obsessive‐compulsive washers. A controlled trial. Behaviour Research and Therapy, 36, 959–970.
   PubMed Web of Science ®Google Scholar
• Keijsers, G. P., Hoogduin, C. A., & Schaap, C. P. (1994). Predictors of treatment outcome in the behavioural treatment of obsessive‐compulsive disorder. The British Journal of Psychiatry, 165, 781–786.
   PubMed Web of Science ®Google Scholar
• Koran, L. M. (2000). Quality of life in obsessive–compulsive disorder. Psychiatric Clinics of North America, 23, 509–517. doi: https://doi.org/10.1016/S0193‐953X(05)70177‐5
   PubMed Web of Science ®Google Scholar
• Koran, L. M., Hanna, G. L., Hollander, E., Nestadt, G., & Simpson, H. B. (2007). Practice guideline for the treatment of patients with obsessive‐compulsive disorder. American Journal of Psychiatry, 164(Suppl), 1–56.
   Google Scholar
• Koran, L. M., Thienemann, M. L., & Davenport, R. (1996). Quality of life for patients with obsessive‐compulsive disorder. American Journal of Psychiatry, 153(6), 783–788.
   PubMed Web of Science ®Google Scholar
• Krochmalik, A., Jones, M. K., & Menzies, R. G. (2001). Danger ideation reduction therapy (DIRT) for treatment‐resistant compulsive washing. Behaviour, Research and Therapy, 39, 897–912.
   PubMed Web of Science ®Google Scholar
• Krochmalik, A., Jones, M. K., Menzies, R. G., & Kirkby, K. (2004). The superiority of danger ideation reduction therapy (DIRT) over exposure and response prevention (ERP) in treating compulsive washing. Behaviour Change, 21, 251–268.
   Web of Science ®Google Scholar
• Leckman, J. F., Denys, D., Simpson, H. B., Mataix‐cols, D., Hollander, E., Saxena, S., … Stein, D. J. (2010). Obsessive–compulsive disorder: A review of the diagnostic criteria and possible subtypes and dimensional specifiers for DSM‐V. Depression and Anxiety, 27, 507–527. doi: https://doi.org/10.1002/da.20669
   PubMed Web of Science ®Google Scholar
• Lindsay, M., Crino, R., & Andrews, G. (1997). Controlled trial of exposure and response prevention in obsessive‐compulsive disorder. British Journal of Psychiatry, 171, 135–139.
   PubMed Web of Science ®Google Scholar
• Mataix‐cols, D., Frost, R. O., Pertusa, A., Clark, L. A., Saxena, S., Leckman, J. F., … Wilhelm, S. (2010). Hoarding disorder: A new diagnosis for DSM‐V? Depression and Anxiety, 27, 556–572. doi: https://doi.org/10.1002/da.20693
   PubMed Web of Science ®Google Scholar
• Mataix‐cols, D., Rauch, S. L., Manzo, P. A., Jenike, M. A., & Baer, L. (1999). Use of factor‐analyzed symptom dimensions to predict outcome with serotonin reuptake inhibitors and placebo in the treatment of obsessive‐compulsive disorder. American Journal of Psychiatry, 156, 1409–1416.
   PubMed Web of Science ®Google Scholar
• Mataix‐cols, D., Rosario‐campos, M. C., & Leckman, J. F. (2005). A multi‐dimensional model of obsessive‐compulsive disorder. American Journal of Psychiatry, 162, 228–238. doi: https://doi.org/10.1176/appi.ajp.162.2.228
   PubMed Web of Science ®Google Scholar
• Matsunaga, H., Hayashida, K., Kiriike, N., Maebayashi, K., & Stein, D. J. (2010). The clinical utility of symptom dimensions in obsessive–compulsive disorder. Psychiatry Research, 180, 25–29. doi: https://doi.org/10.1016/j.psychres.2009.09.005
   PubMed Web of Science ®Google Scholar
• Menzies, R. G., & Clarke, J. C. (1995). Individual response patterns, treatment matching and the effects of behavioural and cognitive interventions for acrophobia. Anxiety, Stress, Coping, 8, 141–160. doi: https://doi.org/10.1080/10615809508249370
   Web of Science ®Google Scholar
• Michelson, L. (1986). Treatment consonance and response profiles in agoraphobia: The role of individual differences in cognitive, behavioural and physiological treatments. Behaviour Research and Therapy, 24, 263–275.
   PubMed Web of Science ®Google Scholar
• National Institute for Clinical Excellence (NICE) (2006). Obsessive compulsive disorder: Core interventions in the treatment of obsessive compulsive disorder and body dysmorphic disorder. Retrieved from http://www.nice.org.uk
   Google Scholar
• O'brien, M., Jones, M. K., & Menzies, R. G. (2004). Danger ideation reduction therapy (DIRT) for Intractable, Adolescent Compulsive Washing: A Case Study. Behaviour Change, 21, 57–65. doi: https://doi.org/10.1375/bech.21.1.57.35974
   Web of Science ®Google Scholar
• Overton, S. M., & Menzies, R. G. (2002). A comparison of checking‐related beliefs in individuals with obsessive compulsive disorder and normal controls. Behaviour Change, 19(2), 67–74. doi: https://doi.org/10.1375/bech.19.2.67
   Web of Science ®Google Scholar
• Overton, S., & Menzies, R. G. (2005). Cognitive change during treatment for compulsive checking. Behaviour Change, 22, 172–184. doi: https://doi.org/10.1375/bech.2005.22.3.172
   Web of Science ®Google Scholar
• Pallanti, S., Hollander, E., Bienstock, C., Koran, L., Leckman, J. F., Marazziti, D., … Zohar, J. (2002). Treatment non‐response in OCD: Methodological issues and operational definitions. International Journal of Neuropsychopharmacology, 5, 181–191.
   PubMed Web of Science ®Google Scholar
• Pallanti, S., Hollander, E., & Goodman, W. K. (2004). A qualitative analysis of nonresponse: Management of treatment‐refractory obsessive‐compulsive disorder. Journal of Clinical Psychiatry, 65(Suppl 14), 6–10.
   Google Scholar
• Radomsky, A. S., Ouimet, A. J., Ashbaugh, A. R., Lavoie, S. L., Parrish, C. L., & O'connor, K. P. (2006). Psychometric properties of the French and English versions of the Vancouver obsessional compulsive inventory and the symmetry, ordering and arranging questionnaire. Cognitive Behaviour Therapy, 35, 164–173.
   Google Scholar
• Rapaport, M. H., Clary, C., Fayyad, R., & Endicott, J. (2005). Quality‐of‐life impairment in depressive and anxiety disorders. The American Journal of Psychiatry, 162, 1171–1178. doi: https://doi.org/10.1176/appi.ajp.162.6.1171
   PubMed Web of Science ®Google Scholar
• Rasmussen, S. A., Eisen, J. L., & Pato, M. T. (1993). Current issues in the pharmacologic management of obsessive compulsive disorder. Journal of Clinical Psychiatry, 54(Suppl), 4–9.
   Google Scholar
• Rheáume, J., & Ladouceur, R. (2000). Cognitive and behavioural treatments of checking behaviours: An examination of individual cognitive change. Clinical Psychology and Psychotherapy, 7, 118–127. doi: 10.1002/(SICI)1099‐0879(200005)7:2<118::AID‐CPP221>3.0.CO;2‐C
   Web of Science ®Google Scholar
• Riggs, D. S., & Foa, E. B. (1993). Obsessive compulsive disorder. In D. H. Barlow (Ed.), Clinical handbook of psychological disorders: A step‐by‐step treatment manual (2nd ed., pp. 189–239). New York: Guilford Press.
   Google Scholar
• Rosa‐alcázar, A. I., Sánchez‐meca, J., Gómez‐conesa, A., & Marín‐martínez, F. (2008). Psychological treatment of obsessive–compulsive disorder: A meta‐analysis. Clinical Psychology Review, 28, 1310–1325. doi: https://doi.org/10.1016/j.cpr.2008.07.001
   PubMed Web of Science ®Google Scholar
• Ruscio, A. M., Stein, D. J., Chiu, W. T., & Kessler, R. C. (2010). The epidemiology of obsessive‐compulsive disorder in the National Comorbidity Survey Replication. Molecular Psychiatry, 15, 53–63. doi: https://doi.org/10.1038/mp.2008.94
   PubMed Web of Science ®Google Scholar
• Sánchez‐meca, J., Gómez‐conesa, A., & Méndez, F. X. (2003). El tratamiento psicológico del trastorno obsesivo–compulsivo en Europa: Un estudio meta‐analítico [The psychological treatment of obsessive–compulsive disorder in Europe: A meta‐analytic study.]. Psicología Conductual, 11, 213–237.
   Google Scholar
• Saxena, S., Brody, A. L., Maidment, K. M., Smith, E. C., Zohrabi, N., Katz, E., … Baxter, L. R. (2004). Cerebral glucose metabolism in obsessive‐compulsive hoarding. American Journal of Psychiatry, 161, 1038–1048.
   PubMed Web of Science ®Google Scholar
• Schulz, K. F., Altman, D. G., Moher, D., & for the CONSORT Group (2010). CONSORT 2010 Statement: Updated guidelines for reporting parallel group randomised trials. British Medical Journal, 340, c332. doi: https://doi.org/10.1136/bmj.c332
   PubMed Web of Science ®Google Scholar
• Stanley, M. A., & Turner, S. M. (1995). Current status of pharmacological and behavioral treatment of obsessive‐compulsive disorder. Behavior Therapy, 26, 163–186.
   Web of Science ®Google Scholar
• Steketee, G., Siev, J., Fama, J. M., Keshaviah, A., Chosak, A., & Wilhelm, S. (2011). Predictors of treatment outcome in modular cognitive therapy for obsessive–compulsive disorder. Depression and Anxiety, 28, 333–341. doi:https://doi.org/10.1002/da.20785
   Web of Science ®Google Scholar
• Thordarson, D. S., Radomsky, A. S., Rachman, S., Shafran, R., Sawchuk, C. N., & Hakstian, A. R. (2004). The Vancouver obsessional compulsive inventory (VOCI). Behaviour Research and Therapy, 42, 1289–1314. doi: https://doi.org/10.1016/j.brat.2003.08.007
   PubMed Web of Science ®Google Scholar
• Urbaniak, G. C., & Plous, S. (2011). Research Randomizer (Version 3.0) [Computer software]. Retrieved from http://www.randomizer.org/
   Google Scholar
• Vaccaro, L. D., Jones, M. K., Menzies, R. G., & St. clare, T. (2010a). Danger ideation reduction therapy For obsessive‐compulsive checkers: A comprehensive guide to treatment. Bowen Hills QLD: Australian Academic Press.
   Google Scholar
• Vaccaro, L. D., Jones, M. K., Menzies, R. G., & Wootton, B. M. (2010b). Danger ideation reduction therapy for obsessive–compulsive checking: Preliminary findings. Cognitive Behaviour Therapy, 39, 293–301. doi: https://doi.org/10.1080/16506073.2010.512643
   Google Scholar
• van den Hout, M. A., & Kindt, M. (2004). Obsessive‐compulsive disorder and the paradoxical effects of perseverative behaviour on experienced uncertainty. Journal of Behavior Therapy and Experimental Psychiatry, 35, 165–181. doi: https://doi.org/10.1016/j.jbtep.2004.04.007
   PubMed Web of Science ®Google Scholar
• van Oppen, P., De haan, E., van Balkom, A. J. L. M., Spinhoven, P., Hoogduin, K., & van Dyck, R. (1995). Cognitive therapy and exposure in vivo in the treatment of obsessive–compulsive disorder. Behaviour Research and Therapy, 33, 379–390.
   PubMed Web of Science ®Google Scholar
• Whittal, M. L., Thordarson, D. S., & Mclean, P. D. (2005). Treatment of obsessive–compulsive disorder: Cognitive behavior therapy vs. exposure and response prevention. Behavior Research and Therapy, 43, 1559–1576.
   PubMed Web of Science ®Google Scholar
• Wilhelm, S., Steketee, G., Reilly‐harrington, N. A., Dechersbach, T., Buhlmann, V., & Baer, L. (2005). Effectiveness of cognitive therapy for obsessive‐compulsive disorder: An open trial. Journal of Cognitive Psychotherapy, 19, 173–179.
   Google Scholar
• World Health Organization (1997). Computerized version of the composite international diagnostic interview, core version 2.1 (CIDI‐Auto‐2.1) manual. Geneva: Author.
   Google Scholar
• Wu, K. D., & Watson, D. (2003). Further investigation of the obsessive‐compulsive inventory: Psychometric analysis in two non‐clinical samples. Journal of Anxiety Disorders, 17, 305–319.
   PubMed Web of Science ®Google Scholar