[1] Childrens Natl Hosp, Prenatal Pediat Inst, Washington, DC USA
[2] Childrens Natl Hosp, Dept Radiol, Washington, DC USA
[3] Univ Texas Southwestern Med Ctr Dallas, Dept Pediat Neurol, Dallas, TX 75390 USA
[4] Cincinnati Childrens Hosp, Cincinnati, OH USA
[5] Childrens Hosp Philadelphia, Dept Radiol, Philadelphia, PA USA
[6] Childrens Hosp Philadelphia, Dept Genet, Philadelphia, PA 19104 USA
[7] Childrens Natl Hosp, Rare Dis Inst, Washington, DC USA