[1] Royal Dutch Assoc Adv Pharm, Postbus 30460, NL-2500 GL The Hague, Netherlands
[2] Leiden Univ, Med Ctr, Dept Clin Pharm & Toxicol, Leiden, Netherlands
[3] Netherlands Pharmacovigilance Ctr Lareb, Shertogenbosch, Netherlands
[4] Inspectorate Hlth Care, Postbus 2680, NL-3500 GR Utrecht, Netherlands
[5] Erasmus MC, Dept Epidemiol, POB 2040, NL-3000 DR Rotterdam, Netherlands