[1] Hainan Med Univ, Hainan Gen Hosp, Dept Gen Surg, Hainan Affiliated Hosp, Haikou, Hainan, Peoples R China
[2] Hainan Med Univ, Dept Anesthesiol, Affiliated Hosp 2, Haikou, Hainan, Peoples R China
[3] Hainan Med Univ, Hainan Gen Hosp, Dept Gen Surg, Hainan Affiliated Hosp, Haikou 570311, Peoples R China