1 Department of Geriatric Surgery, First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shanxi, 710061, People's Republic of China.
2 Department of Oncology Surgery, First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shanxi, 710061, People's Republic of China.
3 Department of Radiotherapy, First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shanxi, 710061, People's Republic of China.
4 Department of Radiotherapy, First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shanxi, 710061, People's Republic of China. gong.tuo@stu.xjtu.edu.cn.
5 Department of Geriatric Surgery, First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shanxi, 710061, People's Republic of China. ydm_723@163.com.