- Correspondence to Professor Young-Ho Khang, Department of Health Policy and Management, Seoul National University College of Medicine, 103 Daehak-ro, Jongno-gu, Seoul 110-799, South Korea;
- Received April 26, 2016
- Revised September 6, 2016
- Accepted September 17, 2016
- First published October 5, 2016.
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