[1] Shandong Univ, Qianfoshan Hosp, Dept Gen Surg, Jinan 250100, Peoples R China
[2] Liaocheng Peoples Hosp, Dept Gen Surg, Liaocheng, Peoples R China
[3] Harbin Med Univ, Affiliated Hosp 1, Hepatosplen Surg Ctr, Dept Gen Surg, Harbin, Peoples R China
[4] Univ Auckland, Fac Med & Hlth Sci, Dept Mol Med & Pathol, Auckland 1, New Zealand