1. Department of Thoracic Surgery, Hebei Provincial Chest Hospital, Shijiazhuang, Hebei 050041, P.R. China
2. Department of Surgery, Hebei Provincial Gucheng County Hospital, Gucheng, Hebei 253800, P.R. China
3. Department of Rehabilitation and Physical Medicine, Hebei Provincial Gucheng County Hospital, Gucheng, Hebei 253800, P.R. China
4. Department of Pharmacy, Hebei Provincial Chest Hospital, Shijiazhuang, Hebei 050041, P.R. China