Funding for this research was provided by:
National Natural Science Foundation of China (81770817)
Article History
Received: 12 June 2019
Accepted: 4 June 2020
First Online: 16 June 2020
Ethics approval and consent to participate
: The survey received ethical approval by the Institutional Review Board of the University of North Carolina at Chapel Hill, the National Institute for Nutrition and Food safety at China Center for Disease Control and Prevention, and the Human and Clinical Research Ethics Committee of the China-Japan Friendship Hospital. All participants signed the written informed consents.
: Not applicable.
: The authors declare no competing interests.