Pan, Changyu
Liu, Xiaoyang
Li, Tao
Wang, Guodong
Sun, Jianmin
Article History
Received: 16 October 2018
Accepted: 28 November 2018
First Online: 7 December 2018
Ethics approval and consent to participate
: Ethics approval was sought and the study was approved by the institutional review board at Shandong Provincial Hospital affiliated to Shandong University. Written informed consent was obtained from all patients.
: All patients involved had given informed consent.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.