- Correspondence to Professor Geum-Youn Gwak, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-Gu, Seoul 06351, South Korea; or Professor Juhee Cho, Department of Clinical Research Design and Evaluation, SAIHST, Sungkyunkwan University, 81 Irwon-ro, Gangnam-Gu, 06351, Seoul, South Korea;
- Received March 14, 2016
- Revised August 11, 2016
- Accepted August 16, 2016
- First published September 6, 2016.
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