Funding for this research was provided by:
National Natural Science Foundation of China (81301671)
Article History
Received: 21 December 2017
Accepted: 24 July 2018
First Online: 6 August 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The study was approved by ethical committee of Xiangya Hospital (document attached as follows).