- Correspondence to Dr Hisatoshi Sugiura, Department of Respiratory Medicine, Tohoku University Graduate School of Medicine, Seiryou-machi, Aoba-ku, Sendai 980-8574, Japan;
- Received August 28, 2016
- Revised May 15, 2017
- Accepted June 5, 2017
- First published July 19, 2017.
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