[1] Univ Hosp Birmingham NHS Fdn Trust, Birmingham Neuroophthalmol Unit, Birmingham B15 2TH, W Midlands, England
[2] Univ Birmingham, Metab Neurol, Inst Metab & Syst Res, Coll Med & Dent Sci, Birmingham B15 2TT, W Midlands, England
[3] Birmingham Hlth Partners, Ctr Endocrinol Diabet & Metab, Birmingham B15 2TH, W Midlands, England
[4] Kings Coll Hosp London, Dept Ophthalmol, London, England
[5] Univ Leeds, Leeds Inst Rheumat & Musculoskeletal Med, Leeds, W Yorkshire, England
[6] Leeds Teaching Hosp NHS Trust, NIHR Leeds Biomed Res Ctr, Leeds, W Yorkshire, England