[1] Univ Florida, Dept Hlth Serv Res Management & Policy, Gainesville, FL 32610 USA
[2] Univ Florida, Dept Community Hlth & Family Med, Gainesville, FL 32610 USA
[3] Univ Florida, Dept Pediat, Div Hematol & Oncol, Gainesville, FL 32610 USA
[4] Univ Southern Calif, Keck Sch Med, Dept Pediat & Pathol, Los Angeles, CA 90027 USA