- Correspondence to Dr Kanmin Xue, NIHR Academic Clinical Lecturer, Nuffield Laboratory of Ophthalmology, Level 6 West Wing, John Radcliffe Hospital, Headley Way, Oxford OX3 9DU, UK;
- Received 11 March 2016
- Revised 15 July 2016
- Accepted 26 July 2016
- Published in print 1 May 2017.
- Published online 18 April 2017.
- Published first 16 August 2016.
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