1. University Hospital (CHUV), Lausanne, Switzerland; Princess Margaret Hospital, Toronto, ON, Canada; University Hospital/Rotterdam Cancer Center, Rotterdam, Netherlands; University of Tübingen Medical School, Tübingen, Germany; University of Western Ontario, London, ON, Canada; University Medical Center, Utrecht, Netherlands; Azienda Ospedale-Università, Ospedale Busonera, Padova, Italy; University of Calgary, Calgary, AB, Canada; EORTC Data Center, Brussels, Belgium