- Correspondence to Dr Jae Chol Choi, Division of Pulmonary Medicine, Department of Internal Medicine, Chung-Ang University Hospital, HeukSeok Ro 102, Dong Jak Gu, Seoul 06973, Republic of Korea;
- Received August 10, 2015
- Revised May 25, 2016
- Accepted July 12, 2016
- First published August 23, 2016.
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