Funding for this research was provided by:
National Natural Science Foundation of China (NO. 81272716)
Shenyang Municipal Science and Technology Plan Project (NO. 17-231-1-49)
Article History
Received: 21 December 2018
Accepted: 22 March 2019
First Online: 11 April 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.
: Informed consent was obtained from all individual participants included in the study.