[1] Friedrich Schiller Univ, Jena Univ Hosp, Inst Gen Practice & Family Med, D-07743 Jena, Germany
[2] Goethe Univ Frankfurt, Inst Gen Practice & Family Med, D-60590 Frankfurt, Germany
[3] Univ Leipzig, Dept Social Med, D-04103 Leipzig, Germany
[4] Univ Med Ctr Hamburg Eppendorf, Dept Primary Med Care, D-20246 Hamburg, Germany
[5] Cent Inst Mental Hlth, D-68159 Mannheim, Germany
[6] Hannover Med Sch, Inst Biometry, D-30623 Hannover, Germany
[7] Univ Dusseldorf, Dept Gen Practice, D-40225 Dusseldorf, Germany
[8] Univ Bonn, Dept Psychiat & Psychotherapy, D-53105 Bonn, Germany
[9] Tech Univ Munich, Dept Psychiat, D-81675 Munich, Germany
[10] Univ Med Ctr Hamburg Eppendorf, Dept Med Sociol & Hlth Econ, D-20246 Hamburg, Germany