[1] Univ Hosp Goettingen, Dept Dermatol, Gottingen, Germany
[2] Univ Hosp Schleswig Holstein, Inst Human Genet, Schleswig Holstein, Germany
[3] Univ Hosp Goettingen, Dept Pathol, Gottingen, Germany
[4] Univ Hosp Goettingen, Dept Hematol, Gottingen, Germany
[5] Leiden Univ, Med Ctr, Dept Dermatol, NL-2300 RA Leiden, Netherlands
[6] Univ Florence, Dept Human Pathol & Oncol, I-50121 Florence, Italy
[7] Univ Florence, Dept Dermatol Sci, I-50121 Florence, Italy