1. Shire Pharmaceuticals, Basingstoke, UK
2. Pfizer, Sandwich, UK
3. GlaxoSmithKline, Ware, UK
4. Boehringher-Ingelheim, Biberach, Germany
5. Abbott, Daix, France
6. AstraZeneca, Alderley Park, UK
7. Actelion, Basel, Switzerland
8. Bioanalysis Department, Johnson & Johnson Pharmaceutical Research & Development, a Division of Janssen Pharmaceutica NV, Turnhoutseweg 30, 2340 Beerse, Belgium.