[1] Radboud Univ Nijmegen, Sci Inst Qual Healthcare, Med Ctr, NL-6525 ED Nijmegen, Netherlands
[2] Maastricht Univ, Sci Inst Qual Healthcare, Dept Gen Practice, Sch Publ Hlth & Primary Care Caphri, Maastricht, Netherlands
[3] Radboud Univ Nijmegen, Dept Gen Practice, Med Ctr, NL-6525 ED Nijmegen, Netherlands
[4] Johns Hopkins Bloomberg Sch Publ Hlth, Dept Int Hlth, Baltimore, MD USA
[5] Univ E Anglia, Sch Med Policy & Practice, Norwich NR4 7TJ, Norfolk, England