1. Institute of Medical Genetics, University Rostock Medical Center, D-18057 Rostock, Germany
2. Institute of Immunology, University Rostock Medical Center, D-18057 Rostock, Germany
3. Institute of Pathology, Elbe Kliniken, Klinikum Stade, D-21682 Stade, Germany
4. Center of Human Genetics, University of Bremen, D-28359 Bremen, Germany