1. Department of Oncology, The Affiliated Hospital of Chengde Medical University, Chengde, China
2. Department of Thoracic Surgery, Shandong Provincial Hospital, Jinan, China
3. Department of Thoracic Surgery, The First Affiliated Hospital of Jinzhou Medical University, Jinzhou, China
4. Cancer Center, The First Affiliated Hospital of Jinzhou Medical University, Jinzhou, China
5. Department of Environmental Health, University of Fukui School of Medical Sciences, Fukui, Japan