[1] UCL Inst Ophthalmol, London, England
[2] Moorfields Eye Hosp, London EC1V 2PD, England
[3] Hammersmith Hosp, Multidisciplinary Vasculitis Clin, London, England
[4] Univ Kebangsaan Malaysia, Dept Ophthalmol, Fac Med, Kuala Lumpur, Malaysia
[5] Univ London Imperial Coll Sci Technol & Med, Div Immunol & Inflammat, Fac Med, London SW7 2AZ, England