Lei, Lei
Zhang, Wei
Gao, Zhongchao
Liu, Long
Yu, Xiaodong
Article History
Received: 5 January 2018
Accepted: 3 March 2018
First Online: 7 April 2018
Compliance with ethical standards
:
: All authors declare that we have no conflict of interest, and the article is approved by all authors for publication. I would like to declare on behalf of my co-authors that the work described was original research that has not been published previously, and not under consideration for publication elsewhere, in whole or in part.
: This article does not contain any studies with human or animal subjects.