1. University Centre for Pharmacy, Department of Pharmacology and Pharmacotherapeutics, Section Pharmacy and Society, University of Groningen, Ant. Deusinglaan 2, 9713 AW Groningen, the Netherlands
2. University Centre for Pharmacy, Groningen
3. World Health Organization collaborating centre for clinical pharmacology and drug policy science in the Department of Health Sciences of the University of Groningen
4. Free University of Amsterdam and the Catholic University of Nijmegen