Article History
Received: 12 July 2020
Accepted: 13 September 2020
First Online: 29 September 2020
Ethics approval and consent to participate
: This retrospective chart review study involving human participants was in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. This study was approved by the Ethics Committee of the First Hospital of Peking University. The number of ethical review was No. (2018) Scientific Research No. (109). Written informed consent was obtained from all individual participants included in the study.
: Not applicable.
: The authors declare that they have no competing interests.