1. Department of Clinical Laboratory, People's Hospital of Rizhao, Rizhao, Shandong 276800, P.R. China
2. Mingzhu Community Service Station, People's Hospital of Zhangqiu District, Jinan, Shandong 250000, P.R. China
3. Department of Thoracic Surgery, Capital Medical University, Beijing Tiantan Hospital, Beijing 100050, P.R. China