- Correspondence to Dr Yoosoo Chang, Department of Occupational and Environmental Medicine, Kangbuk Samsung Hospital, 108 Pyung dong, Jongro-Gu, Seoul, 110-746, Republic of Korea;
- Received August 15, 2014
- Revised January 8, 2015
- Accepted January 15, 2015
- First published March 2, 2015.
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