1. Department of Internal Medicine, Caritas-Krankenhaus, Bad Mergentheim, Academic Teaching Hospital of the University of Würzburg, Bad Mergentheim, Germany
2. Department of Internal Medicine 2, Hospital Meiningen, Meiningen, Germany
3. Department of Internal Medicine, Krankenhaus Märkisch Oderland, Strausberg/Wriezen, Germany
4. Department (Hematology and Oncology), Universitätsklinik Mannheim, Mannheim, Germany