Diabetes and Obesity Program, Center for Endocrinology, Diabetes and Metabolism, Department of Pediatrics, Children's Hospital Los Angeles and Keck School of Medicine of the University of Southern California, Los Angeles, CA, USA. eHealth International, Inc., Seattle, WA, USA. Division of Adolescent and Young Adult Medicine, Children's Hospital Los Angeles and Keck School of Medicine of the University of Southern California, Los Angeles, CA, USA. CTSI Biostatics Core, Saban Research Institute, Los Angeles, CA, USA. Department of Pharmaceutical and Health Economics, School of Pharmacy of the University of Southern California, Los Angeles, CA, USA.