1. Department of Vitreoretinal Surgery, Duke Eye Center, Durham, North Carolina
2. Department of Surgery, Uniformed Services University of the Health Sciences, Bethesda, Maryland
3. Department of Ophthalmology, Walter Reed National Military Medical Center, Bethesda, Maryland
4. Division of Cornea, Cataract and External Diseases, Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland