1. From the Departments of Internal Medicine, Hematology, Oncology, and Immunology, Hospital of the Philipps-University, Marburg; Department of Hematology, St Georg Hospital, Hamburg; Institute for Hematopathology, University of Kiel, Kiel; Institute for Pathology, University of Würzburg, Würzburg; and Institute for Pathology, Hospital Bayreuth, Bayreuth, Germany