We thank study coordinators Mary Ayn Tullier, Justin Fowler, Olufolake Olufowote and Shelly Hopper; the Choctaw Nation of Oklahoma and the Chickasaw Nation; and our study participants and families. We thank the Laboratory for Molecular Biology and Cytometry Research at OUHSC for the use of the Core Facility which provided NanoDrop Nucleic Acid Quantitation Service.