- Correspondence to Dr Dong-Hee Koh, Department of Occupational and Environmental Medicine, International St. Mary's Hospital, Catholic Kwandong University, 25, Simgok-ro 100 beon-gil, Seo-gu, Incheon 404-834, Korea;
- Received March 12, 2014
- Revised December 10, 2014
- Accepted December 26, 2014
- First published January 9, 2015.
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