Jie Wang1, Hong-Zhen Ju1, Mei-Fang Yang2. 1. State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, School of Medicine, Zhejiang University, 79 Qinchun Road, Zhejiang Province, Hangzhou, China. 2. State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, School of Medicine, Zhejiang University, 79 Qinchun Road, Zhejiang Province, Hangzhou, China. Electronic address: rosemary1978@163.com.