- Correspondence to Dr Akiko Narita, Department of Ophthalmology, Okayama Saiseikai General Hospital, 2-25 Kokutai-cho Kita-ku Okayama 700-8511, Japan;
- Received 6 May 2017
- Revised 18 July 2017
- Accepted 16 August 2017
- Published online 11 September 2017.
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