1. Moorfields Eye Hospital, London, UK,
2. Biomedical Research Centre, Moorfields Eye Hospital NHS Foundation Trust and UCL Institute of Ophthalmology, London, UK,
3. National Healthcare Group Eye Institute, Tan Tock Seng Hospital, Singapore,
4. University of Washington, Seattle, Washington, USA, and
5. Surgery Department, Universidad de Alcalá School of Medicine, Madrid, Spain