1. Human Epidermal Growth Factor Receptor Group; Cancer Research UK Molecular Oncology Laboratories, The Weatherall Institute of Molecular Medicine (WIMM), University of Oxford, John Radcliffe Hospital, Oxford, OX3 9DS, UK
2. Gray Institute for Radiation Oncology and Biology, University of Oxford, Old Road Campus Research Building, Off Roosevelt Drive, Churchill Hospital, Oxford, OX3 7DQ, UK