1. Department of Gastroenterology and Hepatology, Amsterdam Gastroenterology & Metabolism, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
2. Department of General Practice and Elderly Care Medicine, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
3. Department of General Practice and Elderly Care Medicine, Amsterdam UMC, Vrije Universiteit Amsterdam, Academic Network of General Practice, Amsterdam, the Netherlands
4. Department of Family Medicine, Care and Public Health Research Institute CAPHRI, Maastricht University, Maastricht, the Netherlands