1. Department of Oncology, Shandong Cancer Hospital and Institute, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan 250117, Shandong Province, P.R. China
2. Centers of Disease Control and Prevention of Shandong Province, Jinan 250014, Shandong Province, P.R. China
3. Affiliated Hospital of Binzhou Medical College, Binzhou 256603, Shandong Province, P.R. China
4. Department of Oncology, Affiliated Hospital of Southwest Medical University, Luzhou 646000, Shihuan Province, P.R. China