[1] Stanford Univ, Pathol, Palo Alto, CA USA
[2] Stanford Blood Ctr, Histocompatibil & Immunogenet Lab, Palo Alto, CA USA
[3] Univ Miami, Pediat, Miami, FL USA
[4] Univ Texas Hlth San Antonio, Pediat, San Antonio, TX USA
[5] Stanford Univ, Pediat, Stanford, CA USA