[1] London Sch Hyg & Trop Med, Epidemiol & Populat Hlth, London, England
[2] UCL, Ctr Clin Pharmacol, London, England
[3] Queens Univ, Vis Sci, Belfast, Antrim, North Ireland
[4] Netherlands Inst Neurosci, Ophthalmogenet, Amsterdam, Netherlands
[5] Natl Inst Hlth Dev, Epidemiol & Biostat, Tallinn, Estonia
[6] Univ Miguel Hernandez, Dept Salud Publ, Alicante, Spain
[7] Univ Bergen, Stavanger Univ Hosp, Bergen, Norway
[8] Aristotle Univ Thessaloniki, Ophthalmol, Thessaloniki, Greece
[9] Univ Paris 05, Ophthalmol, Paris, France