1 Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, ON, Canada.
2 Department of Viroscience, Erasmus University Medical Center, Rotterdam, Netherlands.
3 Division of Epidemiology, Dalla Lana School of Public Health, University of Toronto, Toronto, ON, Canada.
4 Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, ON, Canada; Institute of Biomedical Engineering, University of Toronto, Toronto, ON, Canada. Electronic address: f.gu@utoronto.ca.