[1] Yale Sch Med, Dept Pediat Hematol Oncol, New Haven, CT USA
[2] Yale Univ, Sch Publ Hlth, Dept Chron Dis Epidemiol, New Haven, CT USA
[3] Yale Univ, Sch Med, Canc Outcomes Publ Policy & Effectiveness Res COP, New Haven, CT USA
[4] St Jude Childrens Res Hosp, Dept Epidemiol & Canc Control, 332 N Lauderdale St, Memphis, TN 38105 USA
[5] Georgetown Lombardi Canc Ctr, Washington, DC USA
[6] Yale Sch Publ Hlth, Dept Chron Dis Epidemiol, New Haven, CT USA