Digital documentation of COVID-19 certificates: vaccination status: web annex A: DDCC:VS core data dictionary, 27 August 2021
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World Health Organization. (2021). Digital documentation of COVID-19 certificates: vaccination status: web annex A: DDCC:VS core data dictionary, 27 August 2021. World Health Organization. https://iris.who.int/handle/10665/343264. License: CC BY-NC-SA 3.0 IGO