1. Department of Respiratory Medicine, Jiangxi Provincial People's Hospital Affiliated to Nanchang University, Nanchang, Jiangxi 330006, P.R. China
2. Department of Thoracic Surgery, Jiangxi Provincial People's Hospital Affiliated to Nanchang University, Nanchang, Jiangxi 330006, P.R. China
3. Department of General Surgery, People's Hospital of Shanggao County, Yichun, Jiangxi 336400, P.R. China
4. Department of General Surgery, Ji'an County People's Hospital, Ji'an, Jiangxi 343100, P.R. China
5. Department of Thoracic Surgery, People's Hospital of Yichun City, Yichun, Jiangxi 336000, P.R. China