[1] Univ Bern, ARTORG Ctr Biomed Engn Res, Gerontechnol & Rehabil Grp, Murtenstr 50, CH-3008 Bern, Switzerland
[2] Univ Bern, Bern Univ Hosp, Dept Intens Care Med, Inselspital, Freiburgstr 4, CH-3010 Bern, Switzerland
[3] Univ Bern, Bern Univ Hosp, Dept Neurol, Inselspital, Freiburgstr 16, CH-3010 Bern, Switzerland
[4] Univ Basel, Inst Nursing Sci INS, Fac Med, Dept Publ Hlth DPH, Bernoullistr 28, CH-4056 Basel, Switzerland