1. Department of Thoracic Surgery, The Second Hospital of Hebei Medical University, Shijiazhuang, China
2. Graduate school of Hebei Medical University, Shijiazhuang, China
3. Department of Thoracic Surgery, Hebei Chest Hospital, Shijiazhuang, China
4. Department of Thoracic Surgery, Affiliated Hospital of Chengde Medical University, Chengde, China
5. Clinical Laboratory Center, The Second Hospital of Hebei Medical University, Shijiazhuang, China