1. European Commission, Joint Research Centre, Ispra, Italy (Z.S.)
2. Queen Mary University of London, London, United Kingdom (S.W.D.)
3. Iberoamerican Cochrane Centre, Barcelona, Spain (C.C.)
4. Radiologie am Theater, Paderborn, Germany (A.G.)
5. St. Vincent's University Hospital, Dublin, Ireland (C.Q.)
6. German Cancer Society, Berlin, Germany (M.F.)
7. McMaster University, Hamilton, Ontario, Canada (H.J.S.)