[1] Univ Penn, Ctr Canc, Bone Marrow Program, Philadelphia, PA 19104 USA
[2] Univ Penn, Ctr Canc, Stem Cell Transplant Program, Philadelphia, PA 19104 USA
[3] Univ Penn, Sch Med, Ctr Clin Epidemiol & Biostat, Philadelphia, PA 19104 USA
[4] Childrens Hosp Philadelphia, Div Oncol, Philadelphia, PA 19104 USA
[5] Med Coll Wisconsin, CIBMTR, Milwaukee, WI 53226 USA
[6] MD Anderson Canc Ctr, Dept Blood & Marrow Transplantat, Houston, TX USA
[7] Childrens Hosp Philadelphia, Div Biostat & Epidemiol, Philadelphia, PA 19104 USA