1. UCLA David Geffen School of Medicine; Los Angeles CA USA
2. Department of Medicine; UCLA David Geffen School of Medicine; Los Angeles CA USA
3. Department of Biomathematics; UCLA David Geffen School of Medicine; Los Angeles CA USA
4. Section of Endocrine Surgery; Department of Surgery; UCLA David Geffen School of Medicine; Los Angeles CA USA
5. Division of Gastroenterology; Department of Medicine; UCLA David Geffen School of Medicine; Los Angeles CA USA
6. Sansum Clinic; Santa Barbara CA USA
7. Division of Endocrinology, Diabetes and Hypertension; Department of Medicine; UCLA David Geffen School of Medicine; Los Angeles CA USA
8. Division of Endocrinology; VA Greater Los Angeles Healthcare System; Los Angeles CA USA