1. Department of Laboratory, The First People's Hospital of Changde Affiliated to The University of South China, Changde, Hunan 415000, P.R. China
2. Hunan Provincial Key Laboratory for Special Pathogens Prevention and Control, Institute of Pathogenic Biology, University of South China, Hengyang, Hunan 421001, P.R. China
3. Department of Laboratory, Yuebei People's Hospital, Shaoguan, Guangdong 512026, P.R. China
4. Department of Clinical Medicine, Medical College, University of South China, Hengyang, Hunan 421001, P.R. China