- Correspondence to Professor Donghee Kim, Department of Internal Medicine, Healthcare Research Institute, Seoul National University Hospital Healthcare System Gangnam Center, 737 Yeoksam-dong, Gangnam-gu, Seoul 135-984, Republic of Korea;
- Received January 25, 2013
- Revised June 27, 2013
- Accepted July 1, 2013
- First published July 12, 2013.
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