1. Division of Clinical Pharmacy & Toxicology; Maastricht University Medical Centre; Maastricht The Netherlands
2. Department of Gastroenterology; Zuyderland; Heerlen Netherlands
3. Department of Pharmacy; Radboud University Medical Centre; Nijmegen The Netherlands
4. Division of Pharmacoepidemiology and Clinical Pharmacology; Utrecht Institute for Pharmaceutical Sciences; Utrecht The Netherlands
5. Care and Public Health Research Institute (CAPHRI); Maastricht The Netherlands
6. MRC Lifecourse Epidemiology Unit; Southampton General Hospital, University of Southampton; Southampton UK