[1] Univ Hosp Ulm, Dept Pediat & Adolescent Med, Ulm, Germany
[2] Univ Hosp Ulm, Dept Internal Med, Ulm, Germany
[3] Univ Hosp Ulm, Inst Transfus Med, Ulm, Germany
[4] Inst Clin Transfus Med & Immunogenet, Ulm, Germany
[5] Univ Dusseldorf, Univ Klinikum Dusseldorf, Childrens Hosp, Dept Pediat Oncol Hematol & Clin Immunol, Dusseldorf, Germany
[6] Univ Hosp Aachen, Dept Pathol, Aachen, Germany
[7] Univ Hosp Aachen, Dept Dermatol, Aachen, Germany
[8] Leiden Univ, Med Ctr, Dept Dermatol, Leiden, Netherlands