1. Department of Epidemiology; Erasmus MC; Rotterdam
2. Department of Internal Medicine; Groene Hart Ziekenhuis; Gouda
3. Department of Internal Medicine; Erasmus MC; Rotterdam
4. Department of Hospital Pharmacy; Erasmus MC; Rotterdam
5. Drug Safety Unit; Inspectorate of Health Care; The Hague
6. Department of Medical Informatics; Erasmus MC; Rotterdam the Netherlands