[1] Leiden Univ, Med Ctr, Leiden, Netherlands
[2] Queensland Inst Med Res, Brisbane, Qld 4006, Australia
[3] IRCCS, IDI, Ist Dermopat, Rome, Italy
[4] DDL Diagnost Lab, Voorburg, Netherlands
[5] German Canc Res Ctr, D-6900 Heidelberg, Germany
[6] Univ Cologne, Inst Virol, D-5000 Cologne, Germany
[7] Dept Dermatol & GISED Study Ctr, Bergamo, Italy
[8] Queen Mary Univ London, London, England