1. Department of Physics, University of Surrey, Guildford, UK
2. Medical Radiation Science group, National Physical Laboratory, Teddington, UK
3. The Royal Surrey County Hospital NHS Foundation Trust, Guildford, UK
4. Department of Chemical and Process Engineering, Bioprocess and Biochemical Engineering group (BioProChem), University of Surrey, Guildford, UK
5. Department of Microbial and Cellular Sciences, University of Surrey, Guildford, UK