- Correspondence to Dr Chi Chiao, Institute of Health and Welfare Policy, College of Medicine, National Yang-Ming University, No. 155, Sec. 2, Li-Nong St, Taipei 112, Taiwan;
- Received September 4, 2015
- Revised June 7, 2016
- Accepted June 21, 2016
- First published September 20, 2016.
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