1 Institut Gustave Roussy, 114 rue Edouard Vaillant, 94805 Villejuif France Villejuif, France; European Consortium for Innovative Therapies for Children with Cancer, Villejuif, France. Electronic address: [email protected].
2 Imagine for Margo, Paris, France.
3 Centre for English Language Teaching, University of York, UK.
4 Institute for Cancer Research, London, UK; European Consortium for Innovative Therapies for Children with Cancer, Villejuif, France.