[1] Maastricht Univ, CAPHRI Sch Publ Hlth & Primary Care, Boehringer Ingelheim, NL-6200 MD Maastricht, Netherlands
[2] Radboud Univ Nijmegen, Med Ctr, Dept Primary & Community Care, NL-6525 ED Nijmegen, Netherlands
[3] Univ Coll Roosevelt, Social Sci, Middelburg, Netherlands
[4] Maastricht Univ, CAPHRI Sch Publ Hlth & Primary Care, NL-6200 MD Maastricht, Netherlands