1. Section of Endocrine Surgery, Department of Surgery, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, California, USA.
2. Veterans Health Administration, Greater Los Angeles Healthcare System, Los Angeles, California, USA.
3. National Clinician Scholars Program, University of California Los Angeles, Los Angeles, California, USA.
4. Department of Surgery, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, California, USA.
5. Department of Medicine, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, California, USA.
6. Department of Biostatistics, Fielding School of Public Health, University of California Los Angeles, Los Angeles, California, USA