1. Mary Ann and J. Milburn Smith Child Health Research Program (G.W., K.K.C., X.H., L.A., S.Z., B.W., X.W.), Department of Pediatrics, Northwestern University Feinberg School of Medicine and Children's Memorial Hospital and Children's Memorial Research Center, Chicago, Illinois 60614
2. Department of Pediatrics, and Division of Endocrinology (W.J.B., D.Z.), Department of Pediatrics, Northwestern University Feinberg School of Medicine and Children's Memorial Hospital and Children's Memorial Research Center, Chicago, Illinois 60614
3. Institute for Biomedicine (Z.L., H.X., G.T.), Anhui Medical University, Hefei, China 230032
4. Center for Population Genetics (X.X.), University of Illinois at Chicago School of Public Health, Chicago, Illinois 60612