[1] Univ Freiburg, Fac Med, Inst Med Biometry & Stat, Sect Hlth Care Res & Rehabil Res SEVERA, Freiburg, Germany
[2] Univ Freiburg, Med Ctr, Freiburg, Germany
[3] Univ Freiburg, Fac Med, Inst Med Biometry & Stat, Div Methods Clin Epidemiol, Freiburg, Germany
[4] Univ Freiburg, Fac Med, Ctr Geriatr Med & Gerontol ZGGF, Freiburg, Germany
[5] Assoc Statutory Hlth Insurance Phys Baden Wuertte, Stuttgart, Germany
[6] Nubedian GmbH, Karlsruhe, Germany