Funding for this research was provided by:
National Natural Science Foundation of China (81570370)
Chinese Academy of Medical Sciences Innovation Fund for Medical Sciences (2017-I2M-1-009)
Text and Data Mining valid from 2020-04-28
Received: 13 June 2019
Accepted: 1 April 2020
First Online: 28 April 2020
Ethics approval and consent to participate
: The experimental protocol was established, according to the ethical guidelines of the Helsinki Declaration and was approved by the Human Ethics Committee of Fuwai Hospital. Written informed consent was obtained from individual or guardian participants.
: Not applicable.
: The authors declare that they have no competing interests.