1. Department of Hepatopancreatobiliary Surgery, The Affiliated Hospital of Qinghai University and Qinghai Province Key Laboratory of Hydatid Disease Research, Qinghai University, Xining, Qinghai 81000, P.R. China
2. Department of General Surgery, Shanghai Fourth People's Hospital Affiliated to Tongji University School of Medicine, Shanghai 200081, P.R. China
3. Department of Hematology, Affiliated Fuyang Hospital of Anhui Medical University, Fuyang, Anhui 236000, P.R. China
4. Department of Medical Record Room, The Affiliated Hospital of Qinghai University, Qinghai University, Xining, Qinghai 81000, P.R. China