- Correspondence to Duk-Hee Lee, Department of Preventive Medicine, School of Medicine, Kyungpook University, 101 Dongin-dong, Jung-gu, Daegu 700-422, Korea;
- Received June 16, 2014
- Revised September 1, 2014
- Accepted September 7, 2014
- First published September 30, 2014.
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