基金the National Natural Science Foundation of China(No.20502008)the State Science Foundation of China(No.05300152)the Science Foundation of Tianjin Medical University(No.2006x9d2) for financial support
基金Foundation of Tianjin Medical University(No.2006x9d2)the National Natural ScienceFoundation of Chinathe Major State Basic Research Development Program of China(No.20502008) for financialsupport