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Publisher
- United States Department of Health, Education, and Welfare8
- National Institutes of Health (U.S.)5
- WCVB-TV (Television station : Boston, Mass.)4
- Washington Post Company3
- Advanstar Communications2
- American Society for Microbiology2
- Charles B. Slack, Inc.2
- Howard Hughes Medical Institute2
- New York Times Company2
- Royal Gorge Publishing Corporation2
- United States. Government Printing Office2
- American Heart Association1
- Association for Academic Health Centers1
- Excerpta Medica (Firm)1
- Hahnemann University1
- Interactive Media1
- Massachusetts Medical Society1
- McGraw-Hill Companies1
- National Academy of Sciences (U.S.)1
- New England journal of medicine1