1. Institute of Metabolism and Systems Research, University of Birmingham, Edgbaston, United Kingdom
2. Centre for Endocrinology, Diabetes and Metabolism, Birmingham Health Partners, Birmingham, United Kingdom
3. Birmingham Neuro-Ophthalmology Unit, Department of Ophthalmology, University Hospitals Birmingham NHS Trust, Queen Elizabeth Hospital Birmingham, Birmingham, United Kingdom
4. Department of Neurology, University Hospitals Birmingham NHS Foundation Trust, Birmingham, United Kingdom