[1] Radboud Univ Nijmegen, Med Ctr, Dept Primary & Community Care, Geert Grootepl 21, NL-6525 EZ Nijmegen, Netherlands
[2] Univ Crete, Sch Med, Clin Social & Family Med, Iraklion, Greece
[3] Pharos, Ctr Expertise Hlth Dispar, Utrecht, Netherlands
[4] Australian Natl Univ, Australian Primary Hlth Care Res Inst, Canberra, ACT, Australia