Funding for this research was provided by:
the National Basic Research Program of China (2015CB554304)
Received: 16 November 2019
Accepted: 27 January 2020
First Online: 31 January 2020
Ethics approval and consent to participate
: The study was approved by the Ethics Committees of all three centers, and all participants signed an informed consent form.
: All authors approved the final manuscript.
: The authors declare that they have no competing interests.