- Correspondence to Dr Min Xia, Department of Nutrition, School of Public Health, Sun Yat-sen University, 74 Zhongshan Road 2, Guangzhou, Guangdong Province 510080, China;
- Received November 14, 2016
- Revised March 17, 2017
- Accepted April 2, 2017
- First published May 10, 2017.
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