- Correspondence to Dr Yun-Chul Hong, Department of Preventive Medicine, Seoul National University College of Medicine, 103 Daehangno, Jongno-gu, Seoul 110-799, Korea;
- Received February 17, 2015
- Revised December 8, 2015
- Accepted December 20, 2015
- First published January 14, 2016.
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