1. Second Clinical Medical College Lanzhou University Lanzhou P.R. China
2. Department of General Surgery Gansu Maternal and Child Health Care Hospital Lanzhou P.R. China
3. Department of General Surgery The 940th Hospital of Joint Logistics Support Force of Chinese People’s Liberation Army Lanzhou P.R. China
4. Pathology Department Gansu Province People Hospital Lanzhou P.R. China
5. Clinical Medical College Northwest Minzu University Lanzhou P.R. China