Funding for this research was provided by:
National Institutes of Health (R01-HD30880, DK056350, R24 HD050924, and R01-HD38700)
Fogarty International Center (D43 TW009077, D43 TW007709)
Ministry of Finance of the People’s Republic of China (13103110700015005)
Carolina Population Center,the University of North Carolina at Chapel Hill (P2C HD050924, T32 HD007168)
Received: 30 January 2018
Accepted: 6 June 2018
First Online: 11 June 2018
Ethics approval and consent to participate
: The CNTCS protocol was approved by ethics committee of National Institute for Nutrition and Health, Chinese Center for Disease Control and Prevention. All participants gave their written informed consent before they participated in the study.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.