- Correspondence to Dr Jin-Ha Yoon, Department of Preventive Medicine, The Institute for Occupational Health, Yonsei University College of Medicine, 50, Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea;
- Received January 5, 2016
- Revised July 15, 2016
- Accepted July 27, 2016
- First published September 12, 2016.
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