1. Francis I. Proctor Foundation for Research in Ophthalmology, San Francisco, California, USA
2. University of California, San Francisco, Department of Ophthalmology, Koret Vision Research Center, San Francisco, California, USA
3. The Permanente Medical Group, Kaiser Permanente Oakland Medical Center, Oakland, California, USA
4. Kaiser Permanente Richmond Medical Center, Richmond, California, USA
5. Tufts University School of Medicine, Boston, Massachusetts, USA
6. Stanford University, Department of Ophthalmology, Stanford, California, USA