国家自然科学基金资助项目NO.81371523;重庆市卫生局资助项目NO.2011-1-031,NO.2012-1-017;国家临床重点专科建设项目[2013]544;1.Natural Science Foundation of China:No.81371523;2.Project supported by the Health Bureau of Chongqing:NO.2011-1-031,NO.2012-1-017;3.The national key clinical specialist construction projects:[2013]544