1. University of Birmingham; Public Health, Epidemiology and Biostatistics; Birmingham UK B15 2TT
2. Salisbury NHS Foundation Trust; Department of Plastic and Reconstructive Surgery; Salisbury UK
3. Barts Health NHS Trust; Department of Dermatology; Whitechapel London UK E11BB
4. 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
5. Churchill Hospital; Department of Dermatology; Old Road Headington Oxford UK OX3 7LJ
6. The University of Nottingham; School of Health Sciences; Room D83, Medical school Queens medical centre Nottingham UK NG7 2UH
7. University of Oxford; NDORMS; 2 Chesham Close Oxford UK NW7 4AF
8. Manchester Royal Infirmary; Dermatology; Oxford Road Manchester UK M13 9WL
9. University Hospital of Wales; Welsh Institute of Dermatology; Heath Park Cardiff UK CF14 4XW
10. The University of Nottingham; Centre of Evidence Based Dermatology; Queen's Medical Centre Derby Road Nottingham UK NG7 2UH
11. The University of Nottingham; c/o Cochrane Skin Group; Nottingham UK