1. Department of Ophthalmology, California Pacific Medical Center, San Francisco, California, USA,
2. West Coast Retina Medical Group, San Francisco, California, USA,
3. Department of Vision Science, School of Optometry, University of California, Berkeley, California, USA,
4. Department of Ophthalmology, Stanford University School of Medicine, Stanford, California, USA, and
5. The Francis I. Proctor Foundation, UCSF School of Medicine, San Francisco, California, USA