[1] Univ Nottingham, Ctr Evidence Based Dermatol, Nottingham NG7 2NR, England
[2] Univ Nottingham Hosp, Dept Dermatol, Nottingham NG7 2UH, England
[3] Oxford Univ Hosp NHS Trust, Churchill Hosp, Dept Dermatol, Oxford, England
[4] Univ Aberdeen, Dept Obstet & Gynaecol, Aberdeen, Scotland
[5] NHS Tayside, Ninewells Hosp, Dept Dermatol, Dundee, Scotland
[6] Brighton & Sussex Univ Hosp, Dept Dermatol, Brighton, E Sussex, England
[7] Salford Royal NHS Fdn Trust, Dept Dermatol, Manchester, Lancs, England
[8] Royal Liverpool & Broadgreen Univ Hosp NHS Trust, Dept Dermatol, Liverpool, Merseyside, England
[9] Liverpool Womens NHS Fdn Trust, Liverpool, Merseyside, England
[10] E Lancashire Hosp NHS Trust, Royal Blackburn Hosp, Dept Dermatol, Blackburn, Lancs, England
[11] Leeds Teaching Hosp NHS Trust, Dept Dermatol, Leeds, W Yorkshire, England
[12] Newcastle upon Tyne Hosp NHS Trust, Royal Victoria Infirm, Dept Dermatol, Newcastle Upon Tyne, Tyne & Wear, England