- Accord/HMO
- Alteon
- Amgen, Inc.
- Ampersand Medical
- Anapharm, Inc.
- Aventis
- Biomedical Systems
- Clinical Device Group, Inc.
- Clinical Science and Development LLC
- College of American Pathologists
- Concentra, Inc.
- Cook County Bureau of Health Services
- Covance, Inc.
- Clinical Trial Services (CTS)
- Discus Dental
- DuKane UltraSonics
- EMD Chemicals, Inc.
- GE Healthcare
- Genentech, Inc.
- Glaxo SmithKline
- Global Med-Net
- Health Care Alliance Group, Inc.
- Health Quest
- Huntingdon Life Sciences
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- Hu-Friedy Manufacturing Company, Inc.
- Icon Clinical Research, Inc.
- Institutional Review Board IRB Services
- Ivoclar NA-Laboratory Group
- Janssen Pharmaceutica
- Johnson and Johnson
- Mayne Pharma
- MDS Matrx Medical
- Medifacts International, Inc.
- Mercy Hospital HMO
- National Institute of Health
- Novartis
- Octagon Research Solutions, Inc.
- Peninsula Pharmaceuticals, Inc.
- Precise Publications
- Rightfield Solutions
- Scientific Evidence, Inc.
- SHPS Healthcare Services
- Social and Scientific Systems, Inc.
- SleepMed
- The CORE Foundation
- The UCB Group
- Turning Point Behavior Center
- Vicuron Pharmaceuticals
- Waterloo Industries
- WellCorp, Inc
- Wyeth
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