Funding for this research was provided by:
Key Programme (81330066)
Sanming Project of Medicine in Shenzhen (SZSM201611017)
Received: 23 October 2019
Accepted: 13 April 2020
First Online: 21 April 2020
Ethics approval and consent to participate
: The trial was approved by the Ethics Committee of the National Institute of Nutrition and Health, Chinese Centers for Disease Control and Prevention. The informed consent was also obtained from all subjects prior to participation.
: Not applicable.
: The authors declare that they have no competing interests.