Received: 21 February 2020
Accepted: 12 June 2020
First Online: 27 June 2020
Ethics approval and consent to participate
: This retrospective study was approved by the Ethics Committee of Second Affiliated Hospital of Wenzhou Medical University, and all participants provided written informed consent prior to data collection.
: Not applicable.
: On behalf of all authors, the corresponding author states that there is no conflict of interest.