[1] Univ Texas Hlth Sci Ctr San Antonio, San Antonio, TX USA
[2] Kaiser Permanente, Dept Res & Evaluat, Pasadena, CA USA
[3] Columbia Univ, Irving Med Ctr, New York, NY USA
[4] Pediat Oncol Grp Ontario, Toronto, ON, Canada
[5] Phoenix Childrens Hosp, Ctr Canc & Blood Disorders, Phoenix, AZ USA
[6] Univ Arizona, Phoenix, AZ USA
[7] McMaster Univ, Dept Hlth Res Methods Evidence & Impact, Hamilton, ON, Canada
[8] Childrens Oncol Grp, Monrovia, CA USA
[9] Univ Southern Calif, Dept Populat & Publ Hlth Sci, Los Angeles, CA USA
[10] Childrens Hosp Philadelphia, Pediat & Epidemiol, Philadelphia, PA USA
[11] Univ Penn, Perelman Sch Med, Philadelphia, PA USA
[12] Nemours Ctr Canc & Blood Disorders, Clin Res Nurse Coordinator, Wilmington, DE USA
[13] LSUHSC, Childrens Hosp, New Orleans, LA USA
[14] Hosp Sick Children, Res Inst, 555 Univ Ave, Toronto, ON M5G 1X8, Canada
[15] Univ Toronto, Fac Med, Toronto, ON, Canada
[16] Univ Toronto, Leslie Dan Fac Pharm, Toronto, ON, Canada