Zhang, Haiyan
Funding for this research was provided by:
NSF of China (61603219)
Shandong Jiaotong University Climbing Research Innovation Team Program (Not applicable)
Article History
Received: 26 September 2018
Accepted: 18 February 2019
First Online: 27 April 2019
Competing interests
: The author declares that there is no conflict of interests regarding the publication of this paper.