1. Department of Thoracic Surgery, The Fourth Hospital of Hebei Medical University, Shijiazhuang, Hebei Province 050000, China
2. Department of Oncology, Hebei General Hospital, Shijiazhuang, Hebei Province 050000, China
3. Department of Oncology, Shijiazhuang People’s Hospital, Shijiazhuang, Hebei Province 050000, China
4. Department of Thoracic Surgery, The Fourth Hospital of Handan, Handan, Hebei Province 056000, China