1. Department of Colorectal and Anal Surgery, The Second Hospital, Cheeloo College of Medicine, Shandong University, No.
247 Beiyuan Street, Jinan 250033, Shandong Province, China
2. Department
of Gastrointestinal Surgery, The Affiliated Hospital of Qingdao University, No. 59 Haier Road, Qingdao 266100, Shandong Province,
China
3. Medical Oncology Division, Qingdao Chengyang People's Hospital, Qingdao 266109, Shandong Province, China
4. Department of
Oncology, 970 Hospitals, Joint Logistics Support Force of Chinese People's Liberation Army, Yantai 264002, Shandong Province,
China
5. Chengyang District Center for Disease Control and Prevention, Qingdao 266109, Shandong Province, China
6. Department
of Gastrointestinal Surgery, The Affiliated Hospital of Qingdao University, Qingdao 266000, Shandong Province, China