1. From the University Hospital Gasthuisberg, Leuven; St-Luc University Hospital; Erasme University Hospital, Brussels, Belgium; Deventer Hospital, Deventer, the Netherlands; Centre René Gauducheau, Saint Herblain, France; British Columbia Cancer Agency, Vancouver, British Columbia; Princess Margaret Hospital, Toronto, Ontario, Canada; Medical University, Vienna, Austria; and F. Hoffmann-La Roche, Basel, Switzerland.