Xia, Li-jian
Li, Wen
Zhai, Jian-cheng
Yan, Chuan-wang
Chen, Jing-bo
Yang, Hui https://orcid.org/0000-0002-5961-6155
Article History
Received: 25 October 2019
Accepted: 28 February 2020
First Online: 12 March 2020
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of the First Affiliated Hospital of Shandong First Medical University. All the participants gave written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.