1 The Department of Ophthalmology, California Pacific Medical Center, San Francisco, CA, USA.
2 The Department of Ophthalmology, Stanford University School of Medicine, Stanford, CA, USA.
3 The Francis I. Proctor Foundation, UCSF School of Medicine, San Francisco, CA, USA emmett_cunningham@yahoo.com.
4 Retina Consultants of Orange County, Fullerton, CA, USA.
5 OHSU-PSU School of Public Health, and VA Portland Health Care System, Casey Eye Institute, Oregon Health & Science University, Portland, Oregon, USA.
6 Division of Ophthalmology, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa.