There are errors in the Funding section. The correct funding information is as follows: The project was supported by the National Natural Science Foundation of China (grant numbers: 81370701), the National Clinical Key Subject Construction Project (No.: AXA medical office letter [2013]544), the 2013 Program for Innovation Team Building at Higher Education Institutions in Chongqing, China and the special fund of Chongqing key laboratory (CSTC).