[1] Univ London Imperial Coll Sci Technol & Med, Fac Med, Dept Dermatol, London, England
[2] Univ London Imperial Coll Sci Technol & Med, Fac Med, Dept Primary Care & Populat Hlth Sci, London, England
[3] Univ Coll Swansea, Sch Engn, Swansea, W Glam, Wales