Funding for this research was provided by:
Yangzhou University (PRC Grant NSFC (11571301,11871065), the NSF of Jiangsu Province (BK20181450), the Jiangsu Distinguished Professor Program, and the Yangzhou Talent Program ‘LvYangJingFeng’)
Article History
Received: 27 February 2019
Accepted: 10 October 2019
First Online: 18 November 2019
Compliance with Ethical Standards
:
: The authors declare no conflicts of interest.
: Estimation of parameters have been stated in the body of the paper and included in the reference section.