Received: 17 January 2021
Accepted: 20 April 2021
First Online: 10 May 2021
: All procedures in studies involving human participants were performed in accordance with the ethical standards of the institutional research committee (The Ethics Committee of the First Affiliated Hospital of Chongqing Medical University, approval number: 2019-141) and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The informed consent was waived because the information of all the participants was anonymous and retrospective.
: Not applicable.
: The authors declare that they have no competing interests.