Funding for this research was provided by:
National Natural Science Foundation of China (81471983, 81572022)
Received: 10 January 2018
Accepted: 6 April 2018
First Online: 17 April 2018
Ethics approval and consent to participate
: All of the protocols used in the study were approved by the Institutional Review Board of the Institute of Biomedicine at Anhui Medical University, Hefei, Anhui, China (Permit Number AMU26-080610).
: The authors declare that they have no competing interests.