Funding for this research was provided by:
National Natural Science Foundation of China (81770371, 81570276)
Received: 7 March 2020
Accepted: 7 May 2020
First Online: 13 May 2020
Ethics approval and consent to participate
: Approval of the Ethics Committee of Peking Union Medical College Affiliated Fuwai Hospital and Beijing Anzhen Hospital, Capital Medical University, was obtained before the start of the work.
: Not applicable.
: The authors declare that they have no competing interests.