- Correspondence to Dr Jae-Joon Yim, Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine and Lung Institute, Seoul National University College of Medicine 101 Daehak-ro, Jongno-gu, Seoul 110-744, Republic of Korea;
- Received December 23, 2012
- Revised April 7, 2013
- Accepted April 19, 2013
- First published June 8, 2013.
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