1. From the Department of Transfusion Medicine, University of Ulm, DRK (German Red Cross) Blood Donation Service Baden Württemberg—Hessen, Institute Ulm, Germany; Blood Transfusion Service, SRC (Swiss Red Cross) Bern, Switzerland; Regional Blood Transfusion Center, Department of Clinical Immunology, Skejby Sygehus, Aarhus University Hospital, Denmark; and the Blood Donation Service of the BRK (Bavarian Red Cross), München, Germany.