1. Department of Dermatology; Venereology; and Allergology; University Hospital Essen, University of Duisburg-Essen; Essen Germany
2. Alfried Krupp von Bohlen und Halbach; Endowed Chair for Medical Management; University of Duisburg-Essen; School of Economics; Essen Germany
3. Institute for Health and Social Affairs; FOM School of Economics and Management (non-profit LLC); Essen Germany