Funding for this research was provided by:
National Natural Science Foundation of China (81773502)
Key Research and Development Program of Hainan (ZDYF2016135)
Key Research and Development Program of Hainan (ZDYF2017095)
National Key Research and Development Program (2016YFC1303603)
Received: 29 January 2018
Accepted: 16 August 2018
First Online: 29 August 2018
Ethics approval and consent to participate
: Written informed consent was obtained from all men and women who participated in the CHCCS study. The Ethics Committee of the Hainan branch of the Chinese People’s Liberation Army General Hospital (Sanya, Hainan) approved the study protocol (No. 301hn11201601).
: Not applicable.
: The authors declare that they have no competing interests.
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