[1] Gansu Univ Chinese Med, Gansu Prov Hosp, Clin Med Coll 1, Lanzhou, Peoples R China
[2] Gansu Prov Hosp, Dept Obstet & Gynecol, Lanzhou, Gansu, Peoples R China
[3] Lanzhou Univ, Clin Med Sch 1, Lanzhou, Gansu, Peoples R China
[4] Gansu Prov Hosp, Natl Hlth Commiss NHC, Key Lab Diag & Therapy Gastrointestinal Tumor, Lanzhou, Gansu, Peoples R China
[5] Longnan City Hosp, Peoples Hosp Longnan 1, Longnan, Gansu, Peoples R China