1. Merck & CoKenilworth New Jersey USA
2. Johnson & Johnson New Brunswick New Jersey USA
3. F Hoffmann‐La RocheBasel Switzerland
4. Novartis Pharma AGBasel Switzerland
5. SanofiGentilly France
6. Pfizer Inc, New YorkNew York USA
7. GlaxoSmithKlineWare United Kingdom
8. AstraZeneca Cheshire United Kingdom