1. Department of Dermatology Medical University of Vienna Vienna Austria
2. The Scripps Research Institute La Jolla CA U.S.A
3. Clinical Institute for Laboratory Medicine Medical University of Vienna Vienna Austria
4. Department of Dermatology and Venereology General Hospital Linz Linz Austria
5. Department of Dermatology and Venereology Medical University of Graz Graz Austria
6. Department of Blood Group Serology and Transfusion Medicine Medical University of Vienna Vienna Austria