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Greek President Katerina Sakellaropoulou (L) receives a dose of COVID-19 vaccine at the Evaggelismos Hospital in Athens, Greece, Dec. 27, 2020. (Pool via Xinhua)

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A health worker prepares a dose of COVID-19 vaccine at the Evaggelismos Hospital in Athens, Greece, Dec. 27, 2020. (Pool via Xinhua)

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