1. Department of Oncology, Shouguang People's Hospital, Shouguang, Shandong 262700, P.R. China
2. Department of Thoracic Surgery, Weifang Hospital of Traditional Chinese Medicine, Weifang, Shandong 261041, P.R. China
3. Cancer Center, Weifang Hospital of Traditional Chinese Medicine, Weifang, Shandong 261041, P.R. China
4. Department of Medical Oncology, Weifang Second People's Hospital, Weifang, Shandong 261041, P.R. China