[1] Qingdao Univ, Ctr Tumor Immunol & Cytotherapy, Med Res Ctr, Affiliated Hosp, 1677 Wutaishan Rd, Qingdao 266003, Shandong, Peoples R China
[2] Qingdao Univ, Qingdao Med Sch, Qingdao, Shandong, Peoples R China
[3] Harbin Med Univ, Dept Gastrointestinal Med Oncol, Canc Hosp, Harbin, Heilongjiang, Peoples R China
[4] Tianjin Med Univ Canc Inst & Hosp, Dept Pancreat Canc, Tianjin, Peoples R China