1. Shandong University, Department of Infectious Diseases, Jinan Central Hospital Affiliated to Shandong University, Jinan, 250021 Shandong Province, China
2. Shandong Medical Imaging Research Institute, Jinan, 250021 Shandong Province, China
3. Shandong University, Jinan Infectious Diseases Hospital, Jinan, 250021 Shandong Province, China
4. Jinan Infectious Diseases Hospital, Jinan, 250021 Shandong Province, China