Cleaver SA1, Warren P, Kern M, Hurley CK, Raffoux C, Keller J, Kiesel U, Koza V, Marry E, Mitterschiffthaler A, Nakamura M, Okah CT, Persson U, Radde-Stepaniak T, Ranson L, Raymond J, do Rosario Sancho M, Varla-Leftherioti M, Wiegand T, Winterhager JM, Woodfield DG: Donor work-up and transport of bone marrow--recommendations and requirements for a standardized practice throughout the world from the Donor Registries and Quality Assurance Working Groups of the World Marrow Donor Association (WMDA)