- Correspondence to Dr Mitsuo Hashimoto, Division of Respiratory Diseases, Department of Internal Medicine, The Jikei University School of Medicine, Nishi-Shinbashi, Minato-ku, Tokyo 105-8461, Japan ;
- Received 31 July 2017
- Revised 23 October 2017
- Accepted 25 October 2017
- Published online 9 November 2017.
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