Vaccine 2019 05 20;37(22):2967-2974. Epub 2019 Apr 20.
Medical Research Council: Respiratory and Meningeal Pathogens Research Unit, Department of Science and Technology/National Research Foundation: Vaccine Preventable Diseases, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa; African Leadership in Vaccinology Expertise (ALIVE), Faculty of Health Science, University of the Witwatersrand, South Africa.