1. School of Medicine and Life Sciences, University of Jinan-Shandong Academy of Medical Sciences, Jinan, Shandong, P.R. China
2. Department of Radiation Oncology, Shandong Cancer Hospital Affiliated to Shandong University, Shandong Academy of Medical Sciences, Jinan, Shandong, P.R. China
3. Department of General Surgery, Yanggu People’s Hospital, Liaocheng, Shandong, P.R. China
4. Engineering Research Center for Medical Imaging and Radiation Therapy of Shandong Province, Jinan, Shandong, P.R. China