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- Ultrasonography -- instrumentation1
- Uncertainty1
- United States167
- United States.19
- United States. Agency for Healthcare Research and Quality.1
- United States. Department of Health and Human Services4
- United States. Department of Health and Human Services.83
- United States. Department of Veterans Affairs2
- United States. Food and Drug Administration2
- United States. Food and Drug Administration.76
- United States. Indian Health Service2
- United States. Indian Health Service.1
- United States. Office of National Drug Control Policy1
- Universal Health Insurance2
- Urban Population2
- Urinary Tract Infections -- drug therapy1
- Utah1