1. Chiros International, Buckingham, Pennsylvania
2. Medicines Control Agency, London, England, United Kingdom
3. Servier Laboratories, Ltd., London, England, United Kingdom
4. ZENECA Pharmaceuticals, Macclesfield, England, United Kindom
5. Burroughs Wellcome Co., Greenville, North Carolina
6. ZENECA Pharmaceuticals, Wilmington, Delaware
7. Medicinal Products Agency, Uppsala, Sweden
8. Laboratoire National de Sante‘, Luxembourg