1. Department of Thoracic Surgery and Oncology; The Second Department of Thoracic Surgery; Cancer Center; The First Affiliated Hospital of Xi'an Jiaotong University; Xi'an China
2. School of Humanities & Social Sciences; Xi'an Jiaotong University; Xi'an China
3. Department of Hepatobiliary Chest Surgery; Shaanxi Provincial Corps Hospital of Chinese People's Armed Police Force; Xi'an China
4. Department of Otorhinolaryngology; The First Affiliated Hospital of Xi'an Jiaotong University; Xi'an China