References
- Hovelius B, Widäng K.Förkylning eller bihdleinflammation? (Common cold or sinusitis?). In: Per-Anders Márdh, editor. Infektioner i primärvárd. Stock-holm: Almquist & Wiksell, 1986:75–9.
- Royal College of General Practitioners, Office of Popula-tion Censuses, Department of Health and Social Security. Morbidity statistics from general practice 1981-82. Lon-don, UK: HMSO, 1986.
- Van Duijn NP, Brouwer HJ, Lamberts H. Use of symp-toms and signs to diagnose maxillary sinusitis in general practice: comparison with ultrasonography. BMJ 1992;305:684–7.
- Moss AJ, Parson VL. Current estimates from the National Health Interview Survey, United States 1985. Hyattsville, MD: National Center for Health Statistics, 1986:667.
- Lindbwk M, Hjortdahl P, Johnsen UL-H. Randomised, double blind, placebo controlled trial of penicillin V and amoxicillin in treatment of acute sinus infections in adults. BMJ 1996;313:325–9.
- Lindbwk M, Hjortdahl P, Johnsen UL-H. Use of symp-toms, signs, and blood tests to diagnose acute sinus infec-tions in primary care: comparison with computed tomography. Fam Med–6.
- Berg O, Carenfeldt C. Analysis of symptoms and clinical signs in the maxillary sinus empyema. Acta Otolaryngol 1988;105:343–9.
- Williams JW, Simel DL. Does this patient have sinusitis? Diagnosing acute sinusitis by history and physical exami-nation. JAMA 1993;270:1242–6.
- Zeifer BA. Sinus imaging. In: Bailey BJ, editor. Head and neck surgery, otolaryngology. Philadelphia, PA: Lippin-cott, 1993:350–65.
- Laine FJ, Smoker WRK. The osteomeatal unit and endo-scopic surgery: anatomy, variations, and imaging findings in inflammatory diseases. Am J Roentgenol 1992;159:849–57.
- Pollei S, Harnsberger HR. The radiologic evaluation of the sinonasal region. Postgrad Radiol 1989;9:242–66.
- Lund VJ, Mackay IA. Staging in rhinosinusitis. Rhinology 1993;31:183–4.
- Cox DR. Regression models and life tables. J R Stat Soc (B) 1972;34:187–220.
- SAS system for Windows, version 6.12.
- Slavin RG. Management of sinusitis. J Am Geriatr Soc 1991;39:212–7.