1 Institut für Medizinische Biometrie und Statistik, Universität zu Lübeck, Universitätsklinikum Schleswig-Holstein, Campus Lübeck, Ratzeburger Allee 160, 23538, Lübeck, Deutschland, Germany. reinhard.vonthein@uni-luebeck.de.
2 School of Population Health and Environmental Sciences, Faculty of Life Sciences and Medicine, King's College London, 4th Floor, Addison House, Guy's Campus, London, SE1 1UL, UK.
3 Editorial Office, Graefe's Archive for Clinical and Experimental Ophthalmology, Di-Ep Biomedical Editorial Services Ltd, PO Box 5617, Glasgow, Scotland, G77-9EH, UK.
4 The Royal College of Ophthalmologists National Ophthalmology Database, Gloucestershire Retinal Research Group office, Above Oakley Ward, Cheltenham General Hospital, Cheltenham, GL53 7AN, UK.