- Correspondence to Dr Toyohiro Hirai, Department of Respiratory Medicine, Graduate School of Medicine, Kyoto University, Kawahara 54, Shogoin, Sakyo-ku, Kyoto 606-8507, Japan;
- Received December 5, 2014
- Revised May 2, 2015
- Accepted May 5, 2015
- First published May 29, 2015.
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