1. Department of Ophthalmology, Columbia University Vagelos College of Physicians and Surgeons, New York, NY, USA
2. Edward S. Harkness Eye Institute, Columbia University Irving Medical Center, New York, NY, USA
3. Department of Biostatistics, Columbia University Mailman School of Public Health, New York, NY, USA
4. Harvard Medical School, Massachusetts Eye and Ear Infirmary, Glaucoma Service, Boston, MA, USA