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Wouters, Olivier J., Shadlen, Kenneth C, Salcher-konrad, Maximilian, Pollard, Andrew J, Larson, Heidi J, Teerawattananon, Yot and Jit, Mark (2021) Challenges in ensuring global access to COVID-19 vaccines: production, affordability, allocation, and deployment. The Lancet, 397 (10278). 1023 - 1034. ISSN 0140-6736