Funding for this research was provided by:
Scientific and Technological Support Plan Projects of China (No. 2007BAI05B05)
Medical Science and Technology Project of Henan Province (No. 201602012)
Youth Fund of the First Affiliated Hospital of Zhengzhou University (233)
Received: 16 May 2020
Accepted: 4 August 2020
First Online: 14 August 2020
Ethics approval and consent to participate
: Informed consent was waived due to the retrospective nature of the study.
: Not applicable.
: The authors declare that they have no competing interests.