1. Division of Endocrinology, Department of Pediatrics, University of New Mexico, Albuquerque, New Mexico, USA.
2. Division of Endocrinology, Department of Pediatrics, University of California, San Diego, San Diego, California, USA.
3. Division of Biostatistics, Altman Clinical and Translational Research Institute, University of California, San Diego, La Jolla, California, USA.