1 Division of Pharmacoepidemiology and Clinical Pharmacology, Utrecht Institute for Pharmaceutical Sciences (UIPS), Utrecht University, Utrecht, The Netherlands. r.a.vreman@uu.nl.
2 The National Health Care Institute (ZIN), Diemen, The Netherlands. r.a.vreman@uu.nl.
3 Division of Pharmacoepidemiology and Clinical Pharmacology, Utrecht Institute for Pharmaceutical Sciences (UIPS), Utrecht University, Utrecht, The Netherlands.
4 Roche Nederland BV, Woerden, The Netherlands.
5 The National Health Care Institute (ZIN), Diemen, The Netherlands.
6 Erasmus School of Health Policy & Management, Erasmus University Rotterdam, Rotterdam, The Netherlands.