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Subjects
- Umbilical Cord1
- United States20
- United States -- epidemiology2
- United States. Army. Medical Department.1
- Universidad Nacional Mayor de San Marcos. Facultad de Medicina.1
- Universities1
- University of Pennsylvania. Department of Medicine.1
- University of Pennsylvania. Hospital.4
- Urban Health1
- Urban Population1
- Urethral Diseases1
- Urethral Diseases -- complications1
- Urethral Obstruction -- therapy1
- Urethral Stricture -- complications1
- Urethral Stricture -- surgery1
- Urethral Stricture -- therapy1
- Urinalysis1
- Urinary Bladder Calculi -- surgery1
- Urogenital Surgical Procedures -- methods1
- Urologic Diseases1