[1] Radboud Univ Nijmegen, Med Ctr, Dept Primary & Community Care, NL-6525 ED Nijmegen, Netherlands
[2] NIVEL Netherlands Inst Hlth Serv Res, Utrecht, Netherlands
[3] Buskerud Univ Coll, Dept Hlth Sci, Drammen, Norway
[4] Univ Amsterdam, Acad Med Ctr, Dept Gen Practice, NL-1105 AZ Amsterdam, Netherlands
[5] Australian Natl Univ, Australian Primary Hlth Care Res Inst, Canberra, ACT, Australia
[6] Maastricht Univ, Dept Educ Dev & Res, Maastricht, Netherlands
[7] Northumbria Univ, Newcastle Upon Tyne NE1 8ST, Tyne & Wear, England
[8] Univ Copenhagen, Copenhagen, Denmark