[1] Univ Freiburg, Inst Med Biometry & Stat, Sect Hlth Care Res & Rehabil Res, Fac Med, Hugstetter Str 49, D-79106 Freiburg, Germany
[2] Univ Freiburg, Med Ctr, Hugstetter Str 49, D-79106 Freiburg, Germany
[3] Univ Med Ctr Hamburg Eppendorf, Dept Med Psychol, Martinistr 52, D-20246 Hamburg, Germany
[4] Univ Freiburg, Inst Evidence Med, Ctr Geriatr Med & Gerontol Freiburg, Cochrane Germany Fdn,Fac Med, Breisacher Str 86, D-79110 Freiburg, Germany
[5] Univ Freiburg, Med Ctr, Breisacher Str 86, D-79110 Freiburg, Germany
[6] Univ Freiburg, Ctr Geriatr Med & Gerontol Freiburg, Fac Med, Lehener Str 88, D-79106 Freiburg, Germany
[7] Univ Freiburg, Med Ctr, Lehener Str 88, D-79106 Freiburg, Germany