[1] Univ Frankfurt, German Red Cross Blood Ctr, D-60528 Frankfurt, Germany
[2] Univ Frankfurt, Inst Transfus Med & Immunohematol, D-60528 Frankfurt, Germany
[3] Fred Hutchinson Canc Res Ctr, Seattle, WA 98104 USA
[4] Univ Washington, Dept Med, Div Hematol, Seattle, WA 98195 USA