[1] Baylor Coll Med, Hematol Oncol Sect, Dept Pediat, Houston, TX 77030 USA
[2] Texas Childrens Hosp, Texas Childrens Canc & Hematol Ctr, Houston, TX 77030 USA
[3] Texas Dept State Hlth Serv, Birth Defects Epidemiol & Surveillance Branch, Environm Epidemiol & Dis Registries Sect, Austin, TX USA
[4] Univ Houston, Dept Hlth & Human Performance, Houston, TX USA
[5] Texas Dept State Hlth Serv, Lab Serv Sect, Austin, TX USA
[6] Univ Texas Hlth Sci Ctr Houston UTHealth, Sch Publ Hlth, Dept Epidemiol Human Genet & Environm Sci, Houston, TX USA
[7] Johns Hopkins Univ, Sch Med, Baltimore, MD USA
[8] Univ Texas Hlth Sci Ctr Houston, Sch Publ Hlth, UTHealth, Austin, TX USA