[1] Univ Klinikum ULM, Geriatr Zentrum, Zollernring 26, D-89073 Ulm, Germany
[2] Univ Klinikum ULM, Inst Geriatr Forsch, Zollernring 26, D-89073 Ulm, Germany
[3] Inst Evidenz Med IfEM, Med Fak, Freiburg, Germany
[4] Univ Klinikum Freiburg, Freiburg, Germany
[5] Cochrane Deutschland Stiftung, Freiburg, Germany