四川省卫生厅课题110371;四川省卫生厅科研基金130360;泸州市科技局课题No.2011-1-S361/7;泸州市科技计划项目No.2013-S-48 Supported by the Fund of Sichuan Provincial Department of Health110371;the Scientific Research Fund of Sichuan Provincial Department of Health130360;the Fund of Luzhou Science and Technology BureauNo.2011-1-S361/7;the Science and Technology Plan Project of Luzhou2013-S-48