- Correspondence to Dr Mingzhi Zhang, Department of Ophthalmology, The Joint Shantou International Eye Center of Shantou University and The Chinese University of Hong Kong, Dongxia Road, Jingping District, Shantou 515041, Guangdong, China;
- Received February 9, 2017
- Revised July 23, 2017
- Accepted July 25, 2017
- First published August 30, 2017.
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