Luo, Guo
Yang, Zhi
Article History
Received: 6 December 2017
Revised: 19 February 2018
Accepted: 22 March 2018
First Online: 21 April 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interests in relation to the work in this article.
: Approval was obtained from the Guangzhou Institute of Respiratory Disease for experiments involving human subjects.