1 Department of Ophthalmology, Howard University College of Medicine, Washington, District of Columbia. Electronic address: Salman.yousuf@howard.edu.
2 The Clive O. Callender, M.D., Howard-Harvard Health Sciences Outcomes Research Center, Department of Surgery, Howard University College of Medicine, Washington, District of Columbia.
3 Howard University College of Medicine, Washington, District of Columbia.
4 Department of Ophthalmology, Howard University College of Medicine, Washington, District of Columbia.