[1] Johns Hopkins Univ, Sch Med, Immunogenet Lab, Dept Med, Baltimore, MD 21205 USA
[2] Johns Hopkins Univ, Sch Med, Dept Surg, Baltimore, MD 21205 USA
[3] Cedars Sinai Med Ctr, Comprehens Transplant Ctr, Los Angeles, CA 90048 USA
[4] Duke Univ, Sch Med, Dept Pathol, Durham, NC 27706 USA
[5] Leiden Univ, Ctr Med, Dept Immunohematol & Blood Transfus, Leiden, Netherlands
[6] Univ Calif Los Angeles, David Geffen Sch Med, Dept Pathol & Lab Med, Los Angeles, CA USA