1. Department of Medical Oncology, Jingmen No. 1 People's Hospital, Jingmen, Hubei 448000, P.R. China
2. Department of Oncology, The Central Hospital of Enshi Autonomous Prefecture, Enshi, Hubei 445000, P.R. China
3. Department of Radiotherapy, Jingmen No. 1 People's Hospital, Jingmen, Hubei 448000, P.R. China
4. Department of Oncology, Guangshui No. 1 People's Hospital, Guangshui, Hubei 432700, P.R. China
5. Department of Cardiothoracic Surgery, Suizhou Central Hospital, Suizhou, Hubei 441300, P.R. China