1. PHARMO Institute for Drug Outcomes Research Utrecht The Netherlands
2. Department of Public Health Erasmus University Medical Center Rotterdam The Netherlands
3. Department of Internal Medicine and Dermatology University Medical Center Utrecht Utrecht The Netherlands
4. Netherlands Comprehensive Cancer Organisation Utrecht The Netherlands
5. Department of Gastroenterology and Hepatology Erasmus University Medical Center Rotterdam The Netherlands
6. Department of Epidemiology and Biostatistics VU University Medical Center Amsterdam The Netherlands