[1] Heidelberg Univ, Mannheim Inst Publ Hlth Social & Prevent Med, D-69115 Heidelberg, Germany
[2] Kunming Med Univ, Sch Publ Hlth, Kunming, Peoples R China
[3] Univ Witten Herdecke, Dept Family Oriented & Community Based Care, Witten, Germany
[4] Univ Wuppertal, Nursing Res Sect, Inst Safety Engn, Wuppertal, Germany
[5] Univ Dusseldorf, Dept Med Sociol, D-40225 Dusseldorf, Germany
[6] Univ Wuppertal, Dept Safety Engn, Wuppertal, Germany