[1] Univ Sheffield, Sheffield Dermatol Res, Sheffield, S Yorkshire, England
[2] Sheffield Childrens Hosp, Sheffield, S Yorkshire, England
[3] K Papp Clin Res, Prob Med Res, Waterloo, ON, Canada
[4] Aarhus Univ Hosp, Aarhus, Denmark
[5] Kings Coll London, St Johns Inst Dermatol, London, England
[6] Guys & St Thomas NHS Fdn Trust, London, England
[7] Univ Med Ctr Hamburg Eppendorf, Hamburg, Germany
[8] Pfizer Inc, New York, NY USA
[9] Pfizer Inc, Groton, MA 06340 USA
[10] Pfizer Ltd, Surrey, England