Funding for this research was provided by:
the Science and Technology Planning Project of Guangzhou, China (201510010250)
the Science and Technology Planning Project of Guangdong Province, China ((No. 2014A020208052))
Article History
Received: 3 May 2017
Accepted: 13 February 2018
First Online: 26 February 2018
Compliance with ethical standards
: The care and use of experiment birds were performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments.
: The authors declare that they have no conflict of interest.