- Accord/HMO
- Alteon
- Amgen, Inc.
- Anapharm, Inc.
- Aventis
- Biomedical Systems
- Chiron
- Ciba Specialty Chemicals, Inc.
- Clinical Device Group, Inc.
- Clinical Science and Development
- College of American Pathologists
- Concentra, Inc.
- Cook County Bureau of
Health Services
- Covance, Inc.
- Clinical Trial Services (CTS)
- Discus Dental, Incorporated
- DuKane Corporation
- EMD Chemicals, Inc.
- GE Healthcare
- Genentech, Inc.
- GlaxoSmithKline
- Global Med-Net, Inc.
- Health Care Alliance Group, Inc.
- Health Quest
- Huntingdon Life Sciences
- Illinois Department of Public Health
- ICON Clinical Research, Inc.
- InforMedix
- Institutional Review Board Services
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- InSite Vision, Inc.
- Ivoclar NA-Laboratory Group
- Gentia
- Janssen Pharmaceuticals
- Johnson and Johnson
- MDS Matrx
- Medifacts International, Inc.
- Mercy Hospital HMO
- National Institute of Health
- Novartis
- Octagon Research Solutions, Inc.
- Peninsula Pharmaceuticals, Inc.
- PharmaNet, LLC
- PharmaStar
- Precise Publications, Inc.
- Rightfield Solutions
- RPS
- Scientific Evidence, Inc.
- SleepMed, Inc.
- SHPS Healthcare Services
- Social and Scientific Systems, Inc.
- St. Jude Children's Hospital
- The CORE Foundation
- The UCB Group
- Turning Point Behaviour Center
- Vicuron Pharmaceuticals, Inc.
- Waterloo Industries
- WellCorp, Inc.
- West Coast Clinical Trials
- Wyeth
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