[1] Vrije Univ Brussel, Brussels, Belgium
[2] Univ Ziekenhuis Brussel, Clin Pharmacol & Pharmacotherapy, Brussels, Belgium
[3] Netherlands Inst Hlth Serv Res NIVEL, Utrecht, Netherlands
[4] Univ Groningen, PTEE, Groningen, Netherlands
[5] Royal Pharmaceut Soc Antwerp, Antwerp, Belgium
[6] Sint Maartensklin, Rheumatol & Pharm, Nijmegen, Netherlands