References
- Gastrointestinal disease. Pathophysiology, diagnosis, management3rd ed., M H Sleisenger, J S Fordtran. W. B. Saunders Co., London 1983
- Gunn A, Keddie N. Some clinical observations on patients with gallstones. Lancet 1972; 2: 239–241
- Bouchier I A D, Rhodes K, Brien M. A study of symptomatic and 'silent' gallstones. Scand J Gas-troenterol 1968; 3: 299–304
- Bates T, Mercer J C, Harrison M. Symptomatic gall stone disease: before and after cholecystectomy. Gut 1984; 25: A579–580
- Robert-Thomson I C. Pain after cholecystectomy. Med J Aust 1985; 143: 483–484
- Ooestdam E M M, Duivenvoorden H J, Pondaag W. Predictive value of some psychological tests on the outcome of surgical intervention in low back patients. J Psychosom Res 1981; 25: 227–235
- Thorvaldsen P, Sørensen E B. Psychic vulnerability as a predictor of short term outcome in lumbar surgery: a prospective study. Acta Neurochir 1990; 102: 58–61
- Andersen A B, Sørensen S L. Måling af psykisk sår-barhed. En analyse af visse egenskaber ved sår-barhedstesten. Universitetets Statistiske Institut, Copenhagen 1979
- Kühl P-H, Martini S. Psykisk sårbare (psychic vulnerable). publication no. 102, Socialforskningsinstituttet, Copenhagen 1981, (English summary)
- Langner T S. A twenty-two item screening score of psychiatric symptoms indicating impairment. J Health Hum Behav 1962; 3: 269–276
- Levav I, Arnon A, Portnoy A. Two shortened versions of the Cornell Medical Index—a new test of their validity. Int J Epidemiol 1977; 6: 135–141
- Mantel N, Haenszel W. Statistical aspects of the analysis of data from retrospective studies of disease. J Nat Cancer Inst 1959; 22: 719–748
- McDonald D J, Mazzuca S A. How much of the placebo ‘effect’ is really statistical regression?. Stat Med 1983; 2: 417–427
- Jørgensen T. Abdominal symptoms and gallstone disease: an epidemiological investigation. Hepa-tology 1989; 9: 856–860
- Glambek I, Arnesjø B, Søreide O. Correlation between gallstones and abdominal symptoms in a random population. Scand J Gastroenterol 1989; 24: 277–281
- GREPCO (The Rome group for epidemiology and prevention of cholelithiasis). The epidemiology of gallstone disease in Rome, Italy. I. Prevalence data in men. Hepatology 1988; 8: 904–906
- Barbara L, Sama C, Labate A M M, et al. A population study on the prevalence of gallstone disease: the Sirmione study. Hepatology 1987; 7: 913–917
- Jørgensen T. Prevalence of gallstones in a Danish population. Am J Epidemiol 1987; 126: 912–921
- Ferraris V A. The empty gallbladder syndrome— results of operation for noncalculous biliary disorders. Clin Med 1986; 144: 437–440
- Heaton K A V. Cholelithiasis. Curr Opinion Gastroenterol Biliary Tract Pancreas, R C N Williamson, 1985; 1: 696–702