[1] Austrian Acad Sci, Inst Mol Biotechnol, A-1010 Vienna, Austria
[2] Univ Munster, Dept Dermatol, D-4400 Munster, Germany
[3] Univ Munster, Interdisciplinary Ctr Clin Res, D-4400 Munster, Germany
[4] Leiden Univ, Med Ctr, Dept Immunohematol & Blood Transfus, Leiden, Netherlands