[1] Massachusetts Gen Hosp, Histocompatibil Lab, Dept Pathol, Boston, MA 02114 USA
[2] Massachusetts Gen Hosp, Dept Med, Renal Unit, Boston, MA 02114 USA
[3] Massachusetts Gen Hosp, Dept Surg, Transplantat Unit, Boston, MA 02114 USA
[4] Harvard Univ, Sch Med, Boston, MA USA