1. Merck Research Laboratories 351 North Sumneytown Pike North Wales 19454 PA U.S.A.
2. Eli Lilly 893 S. Delaware Street Indianapolis 46285 IN U.S.A.
3. Department of Health Sciences University of Leicester Adrian Building, University Road Leicester LE1 7RH U.K.
4. Department of Statistics and Operations Research University of North Carolina 318 Hanes Hall Chapel Hill 27599 NC U.S.A.
5. Genentech South San Francisco CA U.S.A.
6. Sanofi‐Aventis Paris France
7. Centre de Recherche de Royallieu Université de Technologie de Compiègne Compiègne Cedex 60205 France
8. INERIS/CRD/VIVA/METO Verneuil en Halatte France