- Correspondence to Dr. Zengwu Wang, Division of Prevention and Community Health, National Center for Cardiovascular Disease, Fuwai Hospital, Pecking Union Medical College & Chinese Academy of Medical Sciences, Beijing 102308, China;
- Received August 6, 2018
- Revised November 21, 2018
- Accepted November 24, 2018
- First published December 7, 2018.
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