1. NIHR Biomedical Research Centre at Moorfields Eye Hospital and UCL Institute of Ophthalmology; 162 City Road London UK EC1V 2PD
2. University of Modena and Reggio Emilia; Italian Cochrane Centre, Department of Diagnostic, Clinical and Public Health Medicine; Modena Italy
3. Institute of Child Health; Department of Epidemiology; 30 Guilford Street London UK WC1N 1EH
4. Institute of Medical Biometry and Medical Informatics, University Medical Center Freiburg; German Cochrane Centre; Berliner Allee 29 Freiburg Germany 79110
5. University of Florence; Department of Translational Surgery and Medicine, Eye Clinic; Largo Brambilla, 3 Florence Italy 50134