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- Ukraine1
- United Kingdom7
- United States71
- United States -- epidemiology1
- United States. Army.1
- United States. Army. Medical Department.1
- United States. Navy Department Bureau of Medicine and Surgery.1
- United States. Navy.4
- Universities2
- Universities -- history1
- Universities -- organization & administration2
- University of Maryland Medical System.1
- University of Pennsylvania.1
- University of Pennsylvania. Department of Medicine.1
- Urban Health1
- Urethra -- physiopathology1
- Urethral Diseases1
- Urethral Obstruction1
- Urethral Stricture2
- Urethral Stricture -- surgery3