Wang, Guangjie
Li, Chuanbin
Liu, Yashou
Xia, Lei
Article History
Received: 8 October 2018
Revised: 13 November 2018
Accepted: 22 November 2018
First Online: 1 December 2018
Compliance with Ethical Standards
:
: The authors have no relevant potential conflicts of interest to declare.
: The study was approved by the ethics committee of Zhoukou Central Hospital. The patients or their relatives gave written informed consent prior to entering the study.