1. University of Florence; Department of Translational Surgery and Medicine, Eye Clinic; Largo Brambilla, 3 Florence Italy 50134
2. Growth in Health Research; Barcelona Spain
3. Queensland University of Technology; School of Optometry and Vision Science; Brisbane Australia
4. Loughborough UK
5. London School of Hygiene & Tropical Medicine; Cochrane Eyes and Vision, ICEH; Keppel Street London UK WC1E 7HT