1. UCLA David Geffen School of Medicine, Los Angeles, California.
2. Department of Biostatistics, UCLA Fielding School of Public Health, Los Angeles, California.
3. Department of Biomathematics, UCLA David Geffen School of Medicine, Los Angeles, California.
4. Section of Endocrine Surgery, UCLA David Geffen School of Medicine, Los Angeles, California.
5. Section of Endocrinology, Diabetes, and Nutrition, Boston University School of Medicine, Boston, Massachusetts.
6. Division of Endocrinology, VA Greater Los Angeles Healthcare System, Los Angeles, California.
7. Division of Endocrinology, UCLA David Geffen School of Medicine, Los Angeles, California.