1. Department of Pulmonary and Critical Care Medicine, The First People's Hospital of Jiangxia District, Wuhan, Hubei 430200, P.R. China
2. Department of Thoracic Surgery, Hanchuan People's Hospital, Xiaogan, Hubei 431600, P.R. China
3. Department of Thoracic Surgery, Macheng People's Hospital, Huanggang, Hubei 438300, P.R. China
4. Department of Thoracic Surgery, Yangxin People's Hospital, Huangshi, Hubei 435200, P.R. China
5. Department of Pulmonary and Critical Care Medicine, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, P.R. China