1. Department of Radiation Oncology, Zhejiang Provincial People’s Hospital, People’s Hospital of Hangzhou Medical College, Hangzhou, P. R. China;
2. Department of Gastroenterology, Zhejiang Provincial People’s Hospital, People’s Hospital of Hangzhou Medical College, Hangzhou, P. R. China;
3. Department of Radiation Oncology, Ningbo Mingzhou Hospital, Ningbo, P.R. China