- Correspondence to Professor Chi-Tai Fang, Institute of Epidemiology and Preventive Medicine, College of Public Health, National Taiwan University, 17 Xuzhou Road, Taipei 100, Taiwan; and Dr Yi-Chun Lo, Centers for Disease Control, Taipei 100, Taiwan;
- Received September 26, 2017
- Revised February 5, 2018
- Accepted February 17, 2018
- First published March 13, 2018.
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