1. From the Department of Medical Epidemiology and Biostatistics (J.S., D.B., F.E., B.R., J.F.L.), Karolinska Institutet, Stockholm; Department of Gastroenterology (J.H.), and University Health Care Research Center (P.A.), Faculty of Medicine and Health, Örebro University, Sweden; Department of Gastroenterology and Hepatology (F.E.), Clarunis University Center for Gastrointestinal and Liver Diseases, Basel, Switzerland; Clinical Epidemiology Division (O.O.), Department of Medicine Solna, Karolinska...