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3. Biden, J. [@JoeBiden] (07/072020). Americans are safer when America is engaged in strengthening global health. On my first day as President, I will rejoin the @who. Obtenido de Twitter: https://twitter.com/JoeBiden/status/1280603719831359489?s=20
4. Branswell, H. (07/07/2020). Trump administration submits formal notice of withdrawal from who. Obtenido de stat News: https://www.statnews.com/2020/07/07/trump-administration-submits-formal-notice-of-withdrawal-from-who/
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