1. University of Nottingham; Division of Epidemiology and Public Health; C120, Clinical Sciences Building - Ph2 City Hospital Campus, Hucknall Road Nottingham UK NG5 1PB
2. University of Edinburgh; Usher Institute of Population Health Sciences and Informatics; Teviot Place Edinburgh UK EH8 9AG
3. University of Edinburgh; College of Medicine and Veterinary Medicine; Edinburgh UK EH16 4TJ
4. Huidcentrum Limburg; Department of Dermatology; Reinaartsingel 50 Maastricht Netherlands 6218AC