1. University Medical Center Groningen, University of Groningen; Department of Dermatology; Hanzeplein 1 Groningen Netherlands 9700RB
2. Skåne University Hospital; Department of Dermatology; Malmö Sweden S 205 02
3. Heidelberg University Hospital; Department of Clinical Social Medicine; Thibautstrasse 3 Heidelberg Germany 69115
4. Nij Smellinghe Hospital Drachten; Department of Dermatology; Drachten Netherlands
5. The University of Nottingham Ningbo; Nottingham China Health Institute; 199 Taikang E Rd Yinzhou Qu Ningbo Zhejiang Sheng China 315000
6. University of Nottingham; Centre of Evidence Based Dermatology; Queen's Medical Centre Derby Road Nottingham UK NG7 2UH