1. Optics and Photonics Group, Faculty of Engineering, University of Nottingham, Nottingham NG7 2RD, United Kingdom
2. School of Life Sciences, University of Nottingham, Nottingham NG7 2RD, United Kingdom
3. School of Medicine, University of Nottingham, Nottingham LE12 5RD, United Kingdom
4. Department of Molecular Medicine, The University of Pavia, Pavia 27100, Italy
5. School of Veterinary Medicine and Science, University of Nottingham, Sutton Bonington LE12 5RD, United Kingdom