1. Diabetes Research Institute, Mills-Peninsula Medical Center, San Mateo, California.
2. Department of Endocrinology, University of California, Los Angeles, Valencia, California.
3. Department of Medicine, University of California, San Francisco, San Francisco, California.
4. FI Proctor Foundation for Research in Ophthalmology and Department of Ophthalmology, University of California, San Francisco, San Francisco, California.