[1] Free Univ Amsterdam Hosp, Dept Dermatol, NL-1081 HV Amsterdam, Netherlands
[2] Free Univ Amsterdam Hosp, Dept Pathol, NL-1081 HV Amsterdam, Netherlands
[3] Leiden Univ, Med Ctr, Dept Radiat Oncol, NL-2300 RA Leiden, Netherlands
[4] Univ Rotterdam, Dept Dermatol, Rotterdam, Netherlands
[5] Univ Groningen, Dept Dermatol, NL-9700 AB Groningen, Netherlands
[6] Univ Utrecht, Dept Dermatol, NL-3508 TC Utrecht, Netherlands
[7] Univ Ghent, Dept Dermatol, B-9000 Ghent, Belgium