[1] Sunderland Eye Infirm, Queen Alexandra Rd, Sunderland SR2 9HP, Durham, England
[2] Bristol Eye Hosp, Lower Maudlin St, Bristol, Avon, England
[3] Cumberland Infirm, Dept Ophthalmol, Carlisle, PA USA
[4] Rigshosp, Eye Dept, Ndr Ringvej 57, DK-2600 Glostrup, Denmark
[5] Acad Med Ctr, Dept Ophthalmol, Meibergdreef 9, NL-1100 DD Amsterdam, Netherlands
[6] Moorfields Eye Hosp, Vitreoretinal Serv, City Rd, London, England
[7] Manchester Royal Eye Hosp, Oxford Rd, Manchester, Lancs, England
[8] Wolverhampton & Midland Counties Eye Infirm, Royal Wolverhampton NHS Trust, Wolverhampton, W Midlands, England
[9] Newcastle Univ, Inst Med Genet, Newcastle Upon Tyne, Tyne & Wear, England