Funding for this research was provided by:
National Science Foundation (51409189)
Article History
Received: 17 September 2018
Accepted: 20 December 2018
First Online: 18 January 2019
Compliance with ethical standards
: This study was performed in strict accordance with the NIH guidelines for the care and use of laboratory animals (NIH Publication No. 85-23 Rev. 1985) and was approved by the Institutional Animal Care and Use Committee of Tianjin University of Technology.
: The authors declare that they have no conflict of interest.