Funding for this research was provided by:
Foundation for the National Institutes of Health (U01AG006786)
Innovative Research Group Project of the National Natural Science Foundation of China (61702556)
Article History
Received: 15 November 2019
Accepted: 28 January 2020
First Online: 6 February 2020
Ethics approval and consent to participate
: Not applicable
: Not applicable
: The authors declare that they have no competing interests.