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- National Center for Health Statistics (U.S.)267
- NetLibrary, Inc236
- ProQuest (Firm)79
- United States. Congress. House. Committee on Interstate and Foreign Commerce. Subcommittee on Health and the Environment59
- National Institute on Drug Abuse57
- National Institutes of Health (U.S.)54
- National Institute of Mental Health (U.S.)53
- Rand Corporation51
- United States. Congress. Office of Technology Assessment51
- Rollins School of Public Health46
- United States. Congress. Senate. Special Committee on Aging45
- United States. Bureau of the Census44
- United States. Congress. Senate. Committee on Labor and Public Welfare. Subcommittee on Health40
- Institute of Medicine (U.S.)39
- United States38
- United States. General Accounting Office38
- United States. Public Health Service38
- United States. Substance Abuse and Mental Health Services Administration. Office of Applied Studies38
- National Cancer Institute (U.S.)35
- United States. Department of Health, Education, and Welfare34