- Correspondence to Professor Won Jin Lee, Department of Preventive Medicine, Korea University College of Medicine, Seoul 136-705, South Korea; Dr Shu-Sen Chang, Institute of Health Behaviors and Community Sciences, National Taiwan University, No.17, Xuzhou Road, Taipei City 10055, Taiwan;
- Received August 3, 2015
- Revised October 16, 2015
- Accepted October 20, 2015
- First published November 11, 2015.
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