国家自然科学基金资助项目81070715;中国卫生部科研基金项目WKJ2008-2-61;福建省创新平台基金项目No. 2010Y2003:National Natural Science Foundation of China81070715;Ministry of Health Research Projects Funded Project, ChinaWKJ2008 - 2 - 61;Innovative Platform Foundation of Fujian Province2010Y2003