1. Warwick Medical School; University of Warwick; Coventry CV4 7AL U.K.
2. Centre of Evidence Based Dermatology; University of Nottingham; NG7 2NR U.K.
3. Division of Applied Medicine; Aberdeen University; Aberdeen AB24 2ZD U.K.
4. Department of Dermatology; NHS Forth Valley; Stirling FK8 2AU U.K.
5. Nottingham Clinical Trials Unit; University of Nottingham; Nottingham NG7 2UH U.K.
6. Edinburgh Clinical Trials Unit; Usher Institute; University of Edinburgh; EH16 4TU U.K.