- Correspondence to Dr Junpei Saito, Department of Pulmonary Medicine, School of Medicine, Fukushima Medical University, Hikarigaoka-1, Fukushima 960-1295, Japan;
- Received June 16, 2016
- Revised October 26, 2016
- Accepted October 27, 2016
- First published November 15, 2016.
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