1. Department of Infectious Diseases, The First Affiliated Hospital, Anhui Medical University, Hefei 230022, PR China
2. Department of Clinical Laboratory, The First Affiliated Hospital, Anhui Medical University, Hefei 230022, PR China
3. Institute of Antibiotics, Huashan Hospital, Fudan University, 12 M. Wulumuqi Road, Shanghai 200040, PR China