Received: 24 February 2020
Accepted: 12 May 2020
First Online: 20 May 2020
Ethics approval and consent to participate
: All procedures performed in studies involving human participants were approved by the Ethics Committee of Qilu Hospital of Shandong University. Informed consent was obtained from all individual participants included in the study.
: All authors have contributed significantly to the content of the article and all authors have read and approve the submission of the manuscript to this journal.
: The authors have declared that no competing interests exists.