作者单位:Peoples Liberat Army Gen Hosp, Dept Gen Surg, Beijing 100853, Peoples R China[1]Peoples Liberat Army Gen Hosp, Inst Basic Med, Dept Immunol, 28 Fuxing Rd, Beijing 100853, Peoples[2]Peoples Liberat Army Gen Hosp, Dept Microbiol, Beijing 100853, Peoples R China[3]