1. Department of Ophthalmology, Columbia University College of Physicians and Surgeons, New York, New York, USA
2. Department of Ophthalmology, Edward S. Harkness Eye Institute, Columbia University Irving Medical Center, NewYork Presbyterian Hospital, New York, New York, USA
3. Ophthalmology Section, Surgical Service, San Francisco Veterans Affairs Health Care System, San Francisco, California, USA
4. Department of Radiology, Columbia University Irving Medical Center, New York-Presbyterian Hospital, New York, New York, USA