Funding for this research was provided by:
National Natural Science Foundation of China (81803500)
National Outstanding Youth Science Fund Project of National Natural Science Foundation of China (CYYPY201814)
Received: 23 February 2020
Accepted: 26 May 2020
First Online: 15 June 2020
Ethics approval and consent to participate
: The study was approved by the ethics committee of Beijing Chao-Yang Hospital and done in accordance with the ethical principles for medical research involving human subjects outlined in the Helsinki Declaration in 1975 (revised in 2013; ExternalRef removed). Informed written consent was taken from all participants.
: Not applicable.
: The authors declare that they have no competing interest.