1. The University of Nottingham; Division of Epidemiology and Public Health; Clinical Sciences Building Nottingham City Hospital NHS Trust Campus, Hucknall Road Nottingham UK NG5 1PB
2. Watford General Hospital; Department of Dermatology; 60 Vicarage Road Watford UK WD18 0HB
3. The University of Nottingham; c/o Cochrane Skin Group; King's Meadow Campus Lenton Lane Nottingham UK NG7 2NR
4. The University of Nottingham; School of Nursing, Faculty of Medicine and Health Science; Room D83, Medical school Queens medical centre Nottingham UK NG7 2UH