Nie, Pei
Wu, Jie
Wang, Hexiang
Zhou, Ruizhi
Sun, Lingling
Chen, Jingjing
Yang, Guangjie http://orcid.org/0000-0003-1783-4282
Funding for this research was provided by:
National Natural Science Foundation of China (81701688, 81601527)
Article History
Received: 15 March 2019
Accepted: 13 May 2019
First Online: 6 June 2019
Ethics approval and consent to participate
: This retrospective study was approved by the Institutional Review Board of the Affiliated Hospital of Qingdao University, and the requirement for informed consent was waived.
: Not applicable.
: The authors declare that they have no competing interest.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.