Wang, Juan
Wang, Nan
Li, Lihua
Ren, Zhenhui
Article History
Received: 31 August 2019
Accepted: 22 November 2019
First Online: 28 November 2019
Compliance with ethical standards
:
: The authors declare no conflict of interest. No conflict of interest exists in the submission of this manuscript, and manuscript is approved by all authors for publication. We would like to declare 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. All the authors listed have approved the manuscript that is enclosed.