北京市自然科学基金项目KZ201210025028;北京市科技计划课题Z11110005880000;北京市卫生系统高层次人才培养计划2011-3-022;the Natural Science Foundation of BeijingKZ201210025028;the Project of Science and Technology Plan of BeijingZ11110005880000;the Training Program for High-level Talents From Beijing Health Industry2011-3-022