[1] Aristotle Univ Thessaloniki, Gen Practice & Hlth Serv Res, Lab Primary Hlth Care, Thessaloniki, Greece
[2] 1st TOMY Serron, Serres, Prefecture Of S, Greece
[3] Avdira Hlth Ctr, Abdera, Prefecture Of X, Greece
[4] Vari Hlth Ctr, Vari, Prefecture Of A, Greece
[5] Pirgi Hlth Ctr, Pirgi, Prefecture Of C, Greece
[6] Nea Kallikratia Hlth Ctr, Nea Kallikratia, Prefecture Of H, Greece
[7] Rodolivos Hlth Ctr, Rodolivos, Prefecture Of S, Greece
[8] Aristotle Univ Thessaloniki Primary Hlth Care Res, Thessaloniki, Greece
[9] Zagliveri Hlth Ctr, Reg Practice Lagadikia, Zagkliveri, Prefecture Of T, Greece
[10] Litochoro Hlth Ctr, Litochoro, Prefecture Of P, Greece
[11] 251 Hellen Air Force Gen Hosp, Athens, Greece
[12] Kalloni Hlth Ctr, Kalloni, Prefecture Of L, Greece
[13] Farkadona Hlth Ctr, Farkadona, Prefecture Of T, Greece
[14] Kato Achaea Hlth Ctr, Kato Achaia, Prefecture Of A, Greece
[15] Univ Lorraine, Pole Malad Vieillissement Gerontol & Soins Pallia, CHRU Nancy, F-54000 Nancy, France
[16] Farsala Hlth Ctr, Reg Practice Zappeio, Farsala, Prefecture Of L, Greece
[17] Aristotle Univ Thessaloniki, Lab Hyg Social & Prevent Med & Med Stat, Thessaloniki, Greece
[18] UCL, Dept Primary Care & Populat Hlth, Royal Free Campus,Rowland Hill St, London NW3 2PF, England