[1] Baylor Coll Med, Pediat, Houston, TX 77030 USA
[2] Baylor Coll Med, Mol & Human Genet, Houston, TX 77030 USA
[3] Baylor Coll Med, Med & Pediat, Houston, TX 77030 USA
[4] Fred Hutchinson Canc Res Ctr, Clin Res, 1124 Columbia St, Seattle, WA 98104 USA
[5] St Jude Childrens Res Hosp, Epidemiol & Canc Control, 332 N Lauderdale St, Memphis, TN 38105 USA
[6] NCI, Div Canc Epidemiol & Genet, Bethesda, MD 20892 USA
[7] Univ Alabama Birmingham, Pediat, Birmingham, AL USA
[8] Duke Univ, Med, Durham, NC 27706 USA