1. Institute for Clinical Immunology and Transfusion Medicine Justus‐Liebig‐University Giessen Germany
2. German Centre for Fetomaternal Incompatibility University Hospital Giessen and Marburg Giessen Germany
3. Department of Thrombosis and Hemostasis University Hospital Giessen and Marburg Giessen Germany
4. Institute for Transfusion Medicine University of Rostock Rostock Germany