1. Division of Analytical and Environmental Toxicology, Department of Laboratory Medicine and Pathology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada T6G 2G3
2. Li Ka Shing Institute of Virology, Department of Medical Microbiology and Immunology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada T6G 2E1
3. National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, No. 15 Datun Road, Beijing, China 100101