Received: 22 January 2021
Accepted: 15 September 2021
First Online: 4 October 2021
: Protocol of this project was reviewed and approved by the Medical Ethics Committee of National Institute for Nutrition and Health, Chinese Center for Disease Control and Prevention (No.: 2017020, 6 November 2017). And all participants gave written informed consent. All methods were performed in accordance with the relevant guidelines and regulations laid down in the 1964 Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.