1. Department of Thoracic Surgery and Oncology, the Second Department of Thoracic Surgery, Cancer Center, First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi Province, P.R. China
2. Department of Gastroenterology, the First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi Province, P.R. China
3. School of Humanities and Social Sciences, Xi’an Jiaotong University, Xi’an, Shaanxi Province, P.R. China
4. Department of Medical Oncology, Cancer Center, First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi Province, P.R. China
5. Department of Vascular and Endovascular Surgery, First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi Province, P.R. China
6. Department of Otorhinolaryngology, First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi Province, P.R. China