- Correspondence to Dr Toshiya Yamamoto, Department of Ophthalmology, Ushiku Aiwa General Hospital, 896 Shishiko-cho, Ushiku-shi, Ibaraki-ken 305-1296 Japan;
- Received 19 April 2015
- Revised 15 July 2015
- Accepted 2 August 2015
- Published online 28 August 2015.
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