1 Department of Ophthalmology and Visual Science, The University of Chicago, Chicago, Illinois.
2 Retina Consultants, Ltd, Des Plaines, Illinois; Cook County Health and Hospitals System, Department of Ophthalmology, Chicago, Illinois.
3 Retina Consultants, Ltd, Des Plaines, Illinois; Cook County Health and Hospitals System, Department of Ophthalmology, Chicago, Illinois; Illinois Eye Institute, Illinois College of Optometry, Department of Clinical Education, Chicago, Illinois; Retinal Vitreal Consultants Ltd, Chicago, Illinois; Department of Ophthalmology, Loyola University Medical Center, Maywood, Illinois.