- 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 14 March 2016
- Revised 11 August 2016
- Accepted 16 August 2016
- Published in print 1 February 2017.
- Published online 6 January 2017.
- Published first 6 September 2016.
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