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Subjects
- U.S. Nuclear Regulatory Commission.1
- Ultrasonic Surgical Procedures -- adverse effects1
- Ultrasonic Surgical Procedures -- instrumentation1
- Ultrasonic Surgical Procedures -- standards1
- Ultrasonography -- instrumentation1
- Uncertainty2
- Uncompensated Care6
- Uncompensated Care -- statistics & numerical data2
- Underage Drinking -- statistics & numerical data1
- Undocumented Immigrants4
- Undocumented Immigrants -- legislation & jurisprudence2
- Undocumented Immigrants -- statistics & numerical data1
- Unemployment1
- Unemployment -- statistics & numerical data2
- Unemployment -- trends2
- United Kingdom2
- United States1,106
- United States Virgin Islands7
- United States.209
- United States. Agency for Healthcare Research and Quality.3