[1] Immanuel Klin Rudersdorf, Brandenburg Med Sch Theodor Fontane, Dept Psychiat & Psychotherapy, Seebad 82-83, D-15562 Rudersdorf, Germany
[2] Brandenburg Med Sch Theodor Fontane, Ctr Hlth Serv Res, Rudersdorf, Germany
[3] Uppsala Univ, Dept Womens & Childrens Hlth, Uppsala, Sweden
[4] Beth Israel Deaconess Med Ctr, Gen Med & Primary Care, Boston, MA 02215 USA
[5] UCL, Social Sci Res Unit, London, England
[6] Kings Coll London, Inst Psychiat Psychol & Neurosci, Dept Biostat & Hlth Informat, London, England
[7] Norwegian Univ Sci & Technol, Dept Comp Sci, Trondheim, Norway