1. Department of Ophthalmology, Wilford Hall Eye Center, 1100 Wilford Hall Loop, Lackland AFB, TX 78236, USA
2. Department of Ophthalmology, Brooke Army Medical Center, 3551 Roger Brooke Dr., San Antonio, TX 78234, USA
3. Department of Surgery, Uniformed Services University of the Health Sciences, 4301 Jones Bridge Road, Bethesda, MD 20814, USA