1. Division of Pediatric Endocrinology, University of Florida, Gainesville, Florida, USA.
2. Jaeb Center for Health Research, Tampa, Florida, USA.
3. Rocky Mountain Clinical Research, Idaho Falls, Idaho, USA.
4. Atlanta Diabetes Associates, Atlanta, Georgia, USA.
5. Division of Endocrinology and Diabetes, Children's Mercy Hospital, Kansas City, Missouri, USA.
6. Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, Minnesota, USA.
7. Department of Pathology and Laboratory Medicine, Children's Mercy Hospital, Kansas City, Missouri, USA.