1 Drexel University College of Medicine (MCF), Philadelphia, Pennsylvania; Department of Ophthalmology (SJW), Retina Service, Weill Cornell Medical College, New York, New York; Department of Ophthalmology (CG), The University of Texas Southwestern Medical Center, Dallas, Texas; Department of Ophthalmology and Visual Sciences (MPML), West Virginia University Eye Institute, Morgantown, West Virginia; and Department of Ophthalmology (ND), St. Christopher's Hospital for Children, Philadelphia, Pennsylvania.