1. Department of Oncology, Affiliated Hospital of Weifang Medical University, Weifang, Shandong 261031, P.R. China
2. Department of Quality Control Division, Affiliated Hospital of Weifang Medical University, Weifang, Shandong 261031, P.R. China
3. Department of Operating Room, Affiliated Hospital of Weifang Medical University, Weifang, Shandong 261031, P.R. China