[1] Arkansas Childrens Res Inst, Little Rock, AR USA
[2] Univ Arkansas Med Sci, Winthrop P Rockefeller Canc Inst, Little Rock, AR 72205 USA
[3] Dana Farber Canc Inst, Dept Biostat, Boston, MA 02115 USA
[4] Univ Southern Calif, Keck Sch Med, Dept Translat Genom, Los Angeles, CA USA
[5] NHGRI, Genet & Mol Biol Branch, NIH, Bethesda, MD 20892 USA