- Correspondence to Dr Yun-Chul Hong, Department of Preventive Medicine, College of Medicine, Seoul National University, 103 Daehangno, Jongno-gu, Seoul 110-799, Republic of Korea;
- Received July 13, 2012
- Revised December 6, 2012
- Accepted December 15, 2012
- First published January 15, 2013.
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