1. Department of Respiratory Medicine and Critical Care, Shandong Qianfoshan Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250014, P.R. China
2. Department of Biomedical Engineering, Jilin Medical College, Jilin 132013, P.R. China
3. Division of Disinfectant and Supply, Shandong Qianfoshan Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250014, P.R. China
4. Department of Magnetic Resonance, Shandong Medical Imaging Research Institute, Shandong University, Jinan, Shandong 250021, P.R. China
5. Faculty of Graduate, Shan Dong First Medical University, Jinan, Shandong 271016, P.R. China