[1] Univ Hosp Bern, Dept Orthoped & Traumatol, Bern, Switzerland
[2] ZHAW Zurich Univ Appl Sci, Inst Nursing, Sch Hlth Profess, Winterthur, Switzerland
[3] Univ Basel, Inst Nursing Sci, Dept Publ Hlth, Basel, Switzerland
[4] Univ Hosp Basel, Dept Nursing & Allied Hlth Profess, Practice Dev Unit, Basel, Switzerland
[5] Univ Dept Geriatr Med FELIX PLATTER, Burgfelderstr 101, CH-4055 Basel, Switzerland