Abstract
The authors thank the family for their cooperation. This work was supported in part by the Baylor College of Medicine Mental Retardation Research Center (National Institute of Child Health and Human Development [NICHD] 2P30-HD24064) and Child Health Research Center (NICHD 1P30-HD27823) (to W.J.C.) and by a March of Dimes grant (to L.G.S.).
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