国家自然科学基金资助项目,Nos.81260306,81160261,31060164;教育部新世纪优秀人才基金资助项目,No.NCET-10-0124;教育部重点科技基金资助项目,No.211146;海南省重点科技基金资助项目,No.DZXM20110038;海南省自然科学基金资助项目,Nos.309034,310044;海南省卫生厅科研基金资助项目,No.琼卫2011-71;National Natural Science Foundation of China,Nos.81260306,81160261 and 31060164;the Program for New Century Excellent Talents in University of China,No.NCET-10-0124;the Key Program of Science and Technology,Ministry of Education of China,No.211146;the Key Program of Science and Technology of Hainan Province,No.DZXM20110038;the Natural Science Foundation of Hainan Province,Nos.309034 and 310044;the Research Fund of Department of Health of Hainan Province,No.2011-71