Fan, Jie
Li, Hui Hua
Liu, Xing Zhen
Huang, Shan
Article History
Received: 7 July 2018
Accepted: 11 February 2019
First Online: 11 March 2019
Compliance with ethical standards
:
: Ethical approval was obtained from the ethics review boards of the Hangzhou Aeronautical Sanatorium of Chinese Air Force.
: The authors declare that they have no conflict of interest.