1. Department of Thoracic Surgery, Affiliated Hospital of Xuzhou Medical University, Xuzhou, China
2. Department of Cardiothoracic Surgery, Xuzhou Cancer Hospital, Xuzhou, China
3. Department of Thoracic Surgery, Tongji University School of Medicine, Shanghai Pulmonary Hospital, Shanghai, China
4. Morphological Research Experiment Center, Xuzhou Medical University, Xuzhou, China.