- Correspondence to Professor Younsuck Koh, Department of Pulmonary and Critical Care Medicine, Asan Medical Center, University of Ulsan College of Medicine, 388-1, Pungnap-dong, Songpa-Ku, Seoul, South Korea;
- Received July 7, 2013
- Revised January 1, 2014
- Accepted January 9, 2014
- First published January 28, 2014.
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