[1] Maastricht Univ, Dept Family Med, CAPHRI, Maastricht, Netherlands
[2] Free Univ Amsterdam, Amsterdam Univ, Amsterdam Publ Hlth Res Inst, Dept Publ & Occupat Hlth,Med Ctr, Amsterdam, Netherlands
[3] Netherlands Inst Hlth Serv Res Nivel, Utrecht, Netherlands
[4] Dept Family Med, P Debyepl 1 DEB1, NL-6229 HA Maastricht, Netherlands