Guo, Wei
Liang, Xiaoliang
Liu, Lei
Guo, Yanli
Shen, Supeng
Liang, Jia
Dong, Zhiming
Article History
Received: 1 November 2018
Accepted: 3 January 2019
First Online: 17 January 2019
Compliance with ethical standards
:
: The authors declare that they have no conflicts of interest.
: The study was approved by the Ethics Committee of the Fourth Hospital, Hebei Medical University.
: Informed consent was obtained from all participants included in the study.