- Correspondence to Dr Songtao Yuan, Department of Ophthalmology, The First Affiliated Hospital of Nanjing Medical University, Nanjing 210029, China; and Weizhong Ge, Department of Ophthalmology, Yixing People’s Hospital, Yixing 214200, China;
- Received 24 July 2017
- Revised 13 September 2017
- Accepted 30 September 2017
- Published online 6 December 2017.
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