1. Department of Nosocomial Infection, Affiliated Qingdao Central Hospital of Qingdao University, Qingdao Cancer Hospital, Qingdao, Shandong 266042, P.R. China
2. Department of Emergency Medicine, Affiliated Qingdao Central Hospital of Qingdao University, Qingdao Cancer Hospital, Qingdao, Shandong 266042, P.R. China
3. Department of Radiophysics, Affiliated Qingdao Central Hospital of Qingdao University, Qingdao Cancer Hospital, Qingdao, Shandong 266042, P.R. China
4. Ward for Phase I Clinical Trial, Affiliated Qingdao Central Hospital of Qingdao University, Qingdao Cancer Hospital, Qingdao, Shandong 266042, P.R. China
5. Department of Pulmonary and Critical Care Medicine, Affiliated Qingdao Central Hospital of Qingdao University, Qingdao Cancer Hospital, Qingdao, Shandong 266042, P.R. China