1. Department of Gastroenterology and Hepatology; Academic Medical Centre; Amsterdam; The Netherlands
2. Department of Gastroenterology and Hepatology; Erasmus MC University Medical Centre; Rotterdam; The Netherlands
3. Department of Public Health; Erasmus MC University Medical Centre; Rotterdam; The Netherlands
4. Department of research and development, NDDO Institute for Prevention and Early Diagnostic; Amsterdam; The Netherlands
5. Department of Clinical Epidemiology; Biostatistics and Bioinformatics, Academical Medical Center; Amsterdam; The Netherlands