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Stacey, Nicholas, Edoka, Ijeoma, Hofman, Karen, Swart, Elizabeth C, Popkin, Barry and Ng, Shu Wen (2021) Changes in beverage purchases following the announcement and implementation of South Africa's Health Promotion Levy: an observational study. The Lancet Planetary Health, 5 (4). e200 - e208. ISSN 2542-5196