DKMS, Stem Cell Donor Registry, Clinical Trials Unit, Dresden, Germany. Department of Internal Medicine I, University Hospital Carl Gustav Carus, TU Dresden, Dresden, Germany. Division of Pulmonology, Department of Internal Medicine I, University Hospital Carl Gustav Carus, TU Dresden, Dresden, Germany. Division of Transfusion Medicine, Department of Internal Medicine I, University Hospital Carl Gustav Carus, TU Dresden, Dresden, Germany. Institute of Medical Microbiology and Hygiene, Institute of Virology, TU Dresden, Dresden, Germany. Division of Infectious Diseases, TU Dresden, Dresden, Germany. DKMS Life Science Lab, Stem Cell Donor Registry, Dresden, Germany. DKMS, Tübingen, Germany.