Funding for this research was provided by:
Natural Science Foundation of Fujian Province of China (2014J06011)
FAFU Science Fund for Distinguished Young Scholars (xjq201402)
Article History
Received: 9 August 2017
Accepted: 10 December 2017
First Online: 1 February 2018
Compliance with ethical standards
:
: All authors declare that they have no conflict of interest.
: This article does not contain any studies that used human participants.