[1] Martin Luther Univ Halle Wittenberg, Inst Hlth & Nursing Sci, Interdisciplinary Ctr Hlth Sci, Magdeburger Str 8, D-06112 Halle, Saale, Germany
[2] Martin Luther Univ Halle Wittenberg, Clin Internal Med 1, Halle, Saale, Germany
[3] Martin Luther Univ Halle Wittenberg, Inst Gen Practice & Family Med, Interdisciplinary Ctr Hlth Sci, Halle, Saale, Germany
[4] Martin Luther Univ Halle Wittenberg, Inst Rehabil Med, Interdisciplinary Ctr Hlth Sci, Halle, Saale, Germany
[5] Martin Luther Univ Halle Wittenberg, Inst Med Epidemiol Biometr & Informat, Interdisciplinary Ctr Hlth Sci, Halle, Germany
[6] Martin Luther Univ Halle Wittenberg, Inst Med Sociol, Interdisciplinary Ctr Hlth Sci, Halle, Saale, Germany
[7] Martin Luther Univ Halle Wittenberg, Inst Hist & Eth Med, Interdisciplinary Ctr Hlth Sci, Halle, Saale, Germany
[8] Tech Univ Munich, Sch Med, Dept Nephrol, Klinikum Rechts Isar, Munich, Germany
[9] Univ Leipzig, Med Ctr, Dept Anesthesiol & Intens Care, Leipzig, Germany
[10] Tech Univ Munich, TUM Med Educ Ctr, Sch Med, Munich, Germany
[11] Univ Wurzburg, Fac Med, Dept Anaesthesiol Intens Care Emergency & Pain Me, Wurzburg, Germany
[12] Univ Leipzig, Univ Med Ctr Leipzig, Dept Med Psychol & Med Sociol, Leipzig, Germany
[13] Cochrane Germany, Cochrane Germany Fdn, Freiburg, Germany
[14] Univ Freiburg, Med Ctr, Freiburg, Germany
[15] Univ Freiburg, Fac Med, Inst Evidence Med, Freiburg, Germany