[1] Erasmus Univ, Sch Med, Pharmacoepidemiol Unit, Dept Internal Med, NL-3000 DR Rotterdam, Netherlands
[2] Erasmus Univ, Sch Med, Pharmacoepidemiol Unit, Dept Epidemiol & Biostat, NL-3000 DR Rotterdam, Netherlands
[3] The Hague Hosp, Cent Pharm, The Hague, Netherlands