1 Center for Infectious Disease Modeling and Analysis, Yale School of Public Health, New Haven, CT, USA.
2 Center for Infectious Disease Modeling and Analysis, Yale School of Public Health, New Haven, CT, USA; Center for Vaccine Development and Global Health, University of Maryland School of Medicine, Baltimore, MD, USA.
3 Center for Infectious Disease Modeling and Analysis, Yale School of Public Health, New Haven, CT, USA. Electronic address: alison.galvani@gmail.com.