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- Library of Congress. Congressional Research Service261
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- Infobase179
- National Institutes of Health (U.S.)134
- ebrary, Inc98
- United States87
- BBC Worldwide Ltd40
- United States. Congress. House. Committee on Veterans' Affairs30
- National Institute of General Medical Sciences (U.S.)28
- United States. Congress. House. Committee on Energy and Commerce. Subcommittee on Health28
- John E. Fogarty International Center for Advanced Study in the Health Sciences25
- United States. Congress. House. Committee on Energy and Commerce. Subcommittee on Health and the Environment22
- ProQuest (Firm)21
- United States. Congress. Senate. Committee on Appropriations. Subcommittee on Departments of Labor, Health and Human Services, Education, and Related Agencies20
- United States. Congress. Senate. Committee on Labor and Human Resources20
- Isaacs, Stephen L.18
- United States. Congress. House. Committee on Energy and Commerce18
- Robert Wood Johnson Foundation17
- United States. Congress. House. Committee on Interstate and Foreign Commerce. Subcommittee on Health and the Environment17