Article History
Received: 7 May 2020
Accepted: 19 August 2020
First Online: 26 August 2020
Ethics approval and consent to participate
: All procedures involving human participants were in accordance to the ethical standards of the Institutional Research Committee and with the 1964 Helsinki Declaration and its later amendments. The protocol was approved by Beijing Chaoyang Hospital, Capital Medical Universisy Ethical Committee, 2020-K-069.Written informed consent was obtained from all individual participants.
: The authors declare that they have no competing interests