1. University of Birmingham; Institute of Applied Health Research; Birmingham UK B15 2TT
2. University Hospitals Birmingham NHS Foundation Trust and University of Birmingham; NIHR Birmingham Biomedical Research Centre; Birmingham UK
3. Churchill Hospital; Department of Dermatology; Old Road Headington Oxford UK OX3 7LE
4. St George's Hospital; Department of Plastic Surgery; London UK
5. Oxford University Hospitals NHS Foundation Trust; Department of Plastic and Reconstructive Surgery; Oxford UK
6. NHS Lothian/University of Edinburgh; Department of Plastic Surgery; 25/6 India Street Edinburgh UK EH3 6HE
7. University Hospital of Wales; Welsh Institute of Dermatology; Heath Park Cardiff UK CF14 4XW
8. Norfolk and Norwich University Hospital NHS Trust; Department of Plastic and Reconstructive Surgery; Colney Lane Norwich UK NR4 7UY
9. School of Medicine; Division of Epidemiology and Public Health; University of Nottingham Nottingham UK NG7 2UH
10. The University of Nottingham; c/o Cochrane Skin Group; Nottingham UK
11. University of Cambridge; Public Health & Primary Care; Strangeways Research Laboratory, Worts Causeway Cambridge UK CB1 8RN
12. University of Nottingham; Centre of Evidence Based Dermatology; Queen's Medical Centre Derby Road Nottingham UK NG7 2UH