1. Department of Pediatrics I, Medical University of Innsbruck, Innsbruck, Tirol, Austria
2. Institute of Experimental Biomedicine, University Hospital Würzburg, Würzburg, Germany
3. Institute of Human Genetics, University of Würzburg, Würzburg, Germany
4. Center for Rare Blood Cell Disorders, Center for Rare Diseases, University Hospital Würzburg, Würzburg, Germany