[1] St Jude Childrens Res Hosp, Dept Radiat Oncol, 332 N Lauderdale St, Memphis, TN 38105 USA
[2] Baylor Coll Med, Dept Pediat, Houston, TX 77030 USA
[3] Univ Calif San Francisco, Dept Radiat Oncol, San Francisco, CA USA
[4] Univ Texas Southwestern Med Ctr Dallas, Dept Radiat Oncol, Dallas, TX 75390 USA
[5] Univ Montpellier, Inst Reg Canc Montpellier, INSERM, Inst Rech Cancerol Montpellier,U1194, Montpellier, France