Funding for this research was provided by:
Scientific Research Project of Capital Health Development (2020-2-4079)
CAMS Innovation Fund for Medical Sciences (2019-I2M-5-046)
Received: 30 April 2020
Accepted: 23 September 2020
First Online: 8 October 2020
Ethics approval and consent to participate
: This study was approved by the Medical Ethics Committee of Peking University. Written informed consent was obtained from each patient.
: Not applicable.
: The authors declare that they have no competing interests.