1. St Laurentius Ziekenhuis, Roermond, The Netherlands
2. EORTC, Brussels (present address: Zeneca Medical Department, Destelbergen, Belgium), Belgium
3. Medical Oncology, University of Udine, Italy
4. Institut Jules Bordet, Brussels, Belgium
5. University of Sheffield, Sheffield, United Kingdom
6. Bristol Royal Infirmary, Bristol, United Kingdom
7. A.Z. Utrecht, Utrecht, The Netherlands
8. Centre Alexis Vautrin, Vandoeuvre-Les Nancy, France
9. Royal Marsden Hospital, Surrey, United Kingdom
10. Hospital Universitario “San Carlos”, Madrid, Spain
11. Institut Gustave Roussy, Paris, France
12. Western Infirmary, Glasgow, Scotland
13. University Hospital Uppsala, Uppsala, Sweden
14. St. George's Hospital, London, United Kingdom
15. Queen Elisabeth Medical Center, Birmingham, United Kingdom
16. Robert Rössle Klinik, Berlin, Germany
17. Ospedali Riuniti, Bergamo, Italy
18. Università di Padova, Padova, Italy
19. Hôpital Ambroise Paré, Boulogne, Paris, France
20. Allgemeines Krankenhaus Wien, Vienna, Austria
21. Martin Luther Universität, Halle, Germany
22. A.Z. Gasthuisberg, Leuven, Belgium
23. St. Radboud University Hospital, Nijmegen, The Netherlands
24. Klinikum Essen-Mitte, Essen, Germany