- Correspondence to Dr Thotsaporn Morasert, Pulmonary and Critical care Medicine, Department of Medicine, Suratthani Hospital, Surat Thani, Suratthani 84000, Thailand;
- Received October 10, 2019
- Revised October 27, 2019
- Accepted December 9, 2019
- First published December 19, 2019.
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