Zhang, Di
Gao, Xianda
Jiang, Jiang
Shen, Yong
Ding, Wenyuan
Cui, Huixian
Article History
Received: 3 December 2017
Accepted: 23 January 2018
First Online: 2 February 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This study was approved by the Institutional Ethics Board of the Third Hospital of Hebei Medical University. The informed consent of measurement and evaluating their data were approved by all participants.