1. Division of Endocrinology and Metabolism, Department of Medicine, University of California, San Francisco, San Francisco, California
2. Diabetes Center, University of California, San Francisco, San Francisco, California
3. Department of Epidemiology and Biostatistics, University of California, San Francisco, San Francisco, California
4. California Pacific Medical Center, Research Institute, San Francisco, California
5. Department of Radiology and Biomedical Imaging, University of California, San Francisco, San Francisco, California
6. Endocrine Research Unit, San Francisco Veterans Affairs Health Care System, San Francisco, California
7. Department of Surgery, University of California, San Francisco, California
8. Surgical Service, San Francisco Veterans Affairs Medical Center, San Francisco, California