1. Oncology Department, The Second Neijiang People's Hospital, Neijiang, Sichaun, P.R. China
2. Department of Gastroenterology, Nan-Chang Hospital, Sun Yat-Sen University, Nanchang, Jiangxi, P.R. China
3. Thoracic Surgery Department, The Second Neijiang People's Hospital, Sichaun, P.R. China
4. Department of Pathology, The Second Neijiang People's Hospital, Sichaun, P.R. China