1. Division of Endocrinology, Diabetes and Metabolism, Saint Louis University School of Medicine, St. Louis, MO, USA
2. Division of Endocrinology, Diabetes and Metabolism, Jacobs School of Medicine and Biosciences, University at Buffalo, Buffalo, NY, USA
3. Endocrine Division, Quest Diagnostics Nichols Institute, San Juan Capistrano, CA, USA
4. Endocrine Division, Quest Diagnostics Nichols Institute, Valencia, CA, USA