1. Department of Medicine, Division of Endocrinology and Metabolism, University of California , San Francisco, CA 94143 , USA
2. Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, University of California , San Francisco, CA 94143 , USA
3. Diabetes Center, University of California , San Francisco, CA 94143 , USA
4. Department of Pediatrics, Division of Endocrinology, University of California , San Francisco, CA 94143 , USA