1 Department of Thoracic Oncology, First Affiliated Hospital of Medical School, Xi'an Jiaotong University, Yanta West Road No. 277, Shaanxi, 710061, China.
2 Department of Radiotherapy, Tangdu Hospital, Fourth Military Medical University, Xi'an, Shaanxi, China.
3 Department of Gastroenterology, Tangdu Hospital, Fourth Military Medical University, Xi'an, Shaanxi, China.
4 Department of Nuclear Medicine, First Affiliated Hospital of Medical School, Xi'an Jiaotong University, Xi'an, Shaanxi, China.
5 Department of Thoracic Oncology, First Affiliated Hospital of Medical School, Xi'an Jiaotong University, Yanta West Road No. 277, Shaanxi, 710061, China. wangjsh@mail.xjtu.edu.cn.