1. Medical Research Center, Shandong Provincial Qianfoshan Hospital, Shandong University, Jinan, Shandong 250014, P.R. China
2. Medical Research Center, Shandong Provincial Qianfoshan Hospital, Shandong University
3. Institute of Microvascular Medicine, Medical Research Center, The First Affiliated Hospital of Shandong First Medical University and Shandong Provincial Qianfoshan Hospital, Jinan, Shandong 250014, P.R. China
4. Department of Infectious Diseases, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong 250021, P.R. China
5. Department of Pathology, Faculty of Medicine and Surgery, University of Malta, Msida, MSD 2080, Malta