Received: 21 September 2020
Accepted: 12 November 2020
First Online: 18 November 2020
Ethics approval and consent to participate
: The study was reviewed and approved by the Ethics Committee of Peking Union Medical College Hospital (Ethical code number: S-k1189–1; date of approval: May 08, 2020).
: Not applicable.
: The authors declare that they have no competing interests.