1. Centre for Ergonomics and Medical Technology, Münster University of Applied Sciences , Steinfurt , Germany
2. Institute for Health Services Research in Dermatology and Nursing (IVDP), University Medical Center Hamburg-Eppendorf (UKE) , Germany
3. Institution for Statutory Accident Insurance and Prevention in the Health and Welfare Services (BGW) , Hamburg , Germany
4. Ergonomics department, TU Berlin , Berlin , Germany