1. Department of Ophthalmology and Visual Sciences, University of Michigan Medical School, Ann Arbor, Michigan.
2. Department of Ophthalmology, Tianjin Medical University Eye Hospital, Tianjin, People's Republic of China.
3. Division of Metabolism, Endocrinology, and Diabetes, Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, Michigan.
4. Ann Arbor Veterans Administration Medical Center, Ann Arbor, Michigan.