Madhi Shabir A, Knoll Maria Deloria
South African Medical Research Council Vaccines and Infectious Diseases Analytical Research Unit and Department of Science/National Research Foundation: Vaccine Preventable Diseases, University of the Witwatersrand, Faculty of Health Science, Johannesburg 2013, South Africa.
Department of International Health, International Vaccine Access Center, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA.
Lancet Infect Dis. 2021 Jun;21(6):751-753. doi: 10.1016/S1473-3099(21)00002-5. Epub 2021 Jan 28.