相关基金:基金项目:国家自然科学基金重点项目(30730102)、首都医学发展科研基金(2005-2009)和“十一五”国家科技支撑计划重点项目 (2007BAI18B11) Supported by the National Natural Foundation of China (30730102) , Beijing Bureau of Health (2005 -2009), and Supported by the Mega-projects of Science Research for the 11th Five-Year (2007BAI18B11 )