- Correspondence to Dr Chung-Kan Peng, Division of Pulmonary Medicine and Critical Care Medicine, Department of Internal Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei 11490, Taiwan;
- Received September 27, 2018
- Revised January 23, 2019
- Accepted January 28, 2019
- First published February 27, 2019.
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