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