[1] UNIV CALIF LOS ANGELES, LOS ANGELES, CA 90024 USA
[2] CHILDRENS HOSP PITTSBURGH, PITTSBURGH, PA USA
[3] CHILDRENS HOSP PHILADELPHIA, PHILADELPHIA, PA USA
[4] CHILDRENS NATL MED CTR, WASHINGTON, DC USA
[5] INDIANA UNIV, SCH MED, INDIANAPOLIS, IN 46202 USA
[6] UNIV MINNESOTA, MINNEAPOLIS, MN 55455 USA
[7] UNIV SO CALIF, SCH MED, LOS ANGELES, CA 90033 USA
[8] MEM SLOAN KETTERING CANC CTR, NEW YORK, NY 10021 USA
[9] CHILDRENS HOSP OAKLAND, OAKLAND, CA USA