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Subjects
- Ulcer1
- United States44
- United States -- epidemiology1
- United States Military Academy.2
- United States. Army1
- United States. Army.1
- United States. Navy.1
- United States. Navy. Medical Department1
- Universities -- organization & administration1
- University of Pennsylvania. Department of Medicine.2
- Urethral Diseases1
- Urethral Diseases -- surgery1
- Urethral Stricture1
- Urinary Bladder Calculi1
- Urinary Bladder Calculi -- surgery1
- Urologic Surgical Procedures3
- Urticaria1
- Uterus2
- Uterus -- physiology1