[1] Oxford Radcliffe Hosp, Dept Dermatol, Oxford, England
[2] John Radcliffe Hosp, Dept Haematol, Oxford OX3 9DU, England
[3] Radcliffe Eye Hosp, Dept Ophthalmol, Oxford, England
[4] S Cleveland Hosp, Dept Dermatol, Middlesbrough, Cleveland, England
[5] New Cross Hosp, Dept Dermatol, Wolverhampton, W Midlands, England
[6] New Cross Hosp, Dept Haematol, Wolverhampton, W Midlands, England
[7] Keio Univ, Dept Dermatol, Tokyo, Japan
[8] Kurume Univ, Dept Dermatol, Fukuoka, Japan