1. Institute of Occupational, Social and Environmental Medicine, Goethe University, Frankfurt am Main, Germany
2. Institute for Occupational Health and Safety (IFA), German Social Accident Insurance (DGUV), Sankt Augustin, Germany
3. Competence Center for Epidemiology and Health Services Research for Healthcare Professionals (CVcare), Institute for Health Services Research in Dermatology and Nursing (IVDP), University Medical Center Hamburg-Eppendorf (UKE), Hamburg, Germany