Affiliation: | 1. Department of Ophthalmology and Visual Sciences, Vanderbilt University Medical Center, Nashville, Tennessee;2. Department of Ophthalmology, Queen''s University, Kingston, Ontario, Canada;3. Indiana University, Department of Ophthalmology, Indianapolis, Indiana;4. Ophthalmic Associates, Anchorage, Alaska;5. Family Eye Group, Ephrata, Pennsylvania;6. Kaiser Permanente, Sacramento, California |