1. Division of Endocrinology, Diabetes, and Metabolism, Department of Medicine, University of California Los Angeles David Geffen School of Medicine, Los Angeles, California.
2. Division of Endocrinology, Diabetes, and Metabolism, Department of Medicine, VA Greater Los Angeles Healthcare System, Los Angeles, California.
3. Section of Endocrine Surgery, Department of Surgery, University of California Los Angeles David Geffen School of Medicine, Los Angeles, California.
4. Department of Biostatistics, University of California Los Angeles, Los Angeles, California.
5. Division of Nephrology and Hypertension, Department of Medicine, University of California Irvine School of Medicine, Orange, California.