Addenbrooke's Hospital, Cambridge, England, United Kingdom
Middlesex Hospital, London, England, United Kingdom
Children's Cancer and Leukaemia Group, Leicester, England, United Kingdom
University Hospitals of Leicester, Leicester, England, United Kingdom
Institut Curie Hopital, Paris, France
Universitaets - Kinderklinik Wuerzburg, Wuerzburg, Germany
Academisch Medisch Centrum at University of Amsterdam, Amsterdam, Netherlands
Universitaetsklinikum des Saarlandes, Homburg, Germany
Institut Gustave Roussy, Villejuif, France
Academisch Medisch Centrum at University of Amsterdam, Amsterdam, Netherlands
University of Chicago Cancer Research Center, Chicago, Illinois, United States
Rainbow Babies and Children's Hospital, Cleveland, Ohio, United States
West Virginia University Health Sciences Center - Charleston, Charleston, West Virginia, United States
Universitair Ziekenhuis Gent, Ghent, Belgium
Rikshospitalet University Hospital, Oslo, Norway
Birmingham Children's Hospital, Birmingham, England, United Kingdom