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Greece's Prime Minister Kyriakos Mitsotakis receives an injection with a dose of COVID-19 vaccine, at the Attikon University Hospital in Athens, Sunday, Dec. 27, 2020. Doctors, nurses and the elderly rolled up their sleeves across the European Union to receive the first doses of the coronavirus vaccine Sunday in a symbolic show of unity and moment of hope for a continent confronting its worst health care crisis in a century. (Kostas Tsironis/Pool via AP)