Article History
Received: 14 May 2020
Accepted: 28 September 2020
First Online: 2 October 2020
Compliance with Ethical Standards
: All procedures performed in the retrospective study involving human participants were in accordance with the ethical standards of the Ethics Committee of the Northern Jiangsu People’s Hospital (reference no. 2018063) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: The authors declare that they have no conflict of interest.