1. Department of Medical Physics, Guy’s Cancer Centre, Guy’s and St Thomas’ NHS Foundation Trust, London, UK
2. School of Biomedical Engineering & Imaging Sciences, King's College London, London, United Kingdom
3. Radiotherapy Physics, National Radiotherapy Trials Quality Assurance Group (RTTQA), Mount Vernon Cancer Centre, Northwood, UK
4. Metrology for Medical Physics Centre, National Physical Laboratory, Teddington, UK
5. Radiotherapy Physics, University College London Hospitals NHS Foundation Trust, London, UK
6. Medical Physics and Bioengineering Department, University College London, London, UK