Xu, Tianxiang
Switkowski, Krzysztof
Chen, Xin
Liu, Shan
Koynov, Kaloian http://orcid.org/0000-0002-4062-8834
Yu, Haohai
Zhang, Huaijin
Wang, Jiyang
Sheng, Yan
Krolikowski, Wieslaw
Article History
Received: 17 November 2017
Accepted: 5 July 2018
First Online: 6 August 2018
Competing interests
: The authors declare no competing interests.