- Correspondence to Professor Jung Pyo Lee, Department of Internal Medicine, Seoul National University Boramae Medical Center, 20 Boramae-ro 5-gil, Dongjak-gu, Seoul 156-707, Republic of Korea;
- Received 13 May 2015
- Revised 28 August 2015
- Accepted 1 September 2015
- Published online 28 September 2015.
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