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Subjects
- Umbilicus -- abnormalities1
- Umbilicus -- pathology1
- United Kingdom2
- United States47
- United States. Army. Hospital Corps.1
- United States. Army. Medical Department1
- United States. Marine Hospital Service.1
- United States. Weather Bureau1
- Universities4
- Unnecessary Procedures1
- Urban Health1
- Urbanization1
- Uremia -- complications1
- Uremia -- therapy1
- Ureter -- surgery1
- Ureteral Diseases -- surgery1
- Urethra -- injuries1
- Urethral Stricture1
- Urethral Stricture -- surgery1
- Urethral Stricture -- therapy1