[1] Univ Freiburg, Sect Hlth Care Res & Rehabil Res, Med Ctr, Hugstetter St 49, D-79106 Freiburg, Germany
[2] Univ Freiburg, Fac Med, Hugstetter St 49, D-79106 Freiburg, Germany
[3] Univ Pittsburgh, Sch Med, Ctr Behav Hlth & Smart Technol, Pittsburgh, PA 15260 USA
[4] Univ Goettingen, Med Ctr, Dept Psychosomat Med & Psychotherapy, Gottingen, Germany
[5] Niederrhein Clin, Bad Neuenahr Ahrweiler, Germany
[6] Univ Lubeck, Inst Social Med & Epidemiol, Lubeck, Germany