1. Diagnostic approaches in acute cholecystitis; a prospective study of 1333 patients with acute abdominal pain;Eskelinen;Theor Surg,1993
2. Abdominal pain. An analysis of 1000 consecutive cases in a university hospital emergency room;Brewer;Am J Surg,1976
3. Acute abdominal pain in patients over 50years of age;Telfer;Scand J Gastroenterol,1988
4. Les syndromes douloureux aigus de l’abdomen. Étude prospective multicentrique;ARC-AURC;Presse Med,1981
5. Acute cholecystitis treated by early and delayed surgery. A controlled clinical trial;Lahtinen;Scand J Gastroenterol,1978