[1] Netherlands Inst Hlth Serv Res, Nivel, Otterstr 118, NL-3513 CR Utrecht, Netherlands
[2] Tilburg Univ, Tilburg Sch Social & Behav Sci, Tranzo, Tilburg, Netherlands
[3] Univ Groningen, Univ Med Ctr Groningen, Dept Surg, Groningen, Netherlands
[4] Univ Groningen, Groningen Res Inst Pharm, Fac Sci & Engn, Dept PharmacoTherapy Epidemiol & Econ PTEE, Groningen, Netherlands