Received: 2 February 2020
Accepted: 7 July 2020
First Online: 15 July 2020
Ethics approval and consent to participate
: The protocol of this study was approved by the Ethics Committee of the Second Affiliated Hospital of Xi’an Jiaotong University Shaanxi Province (Xi’an, China). All patients gave written informed consent prior to participation in the study.
: Not applicable.
: We declare no conflicts of interest for this study.