People wait in line for the opening of a 24-hour, walk-up COVID-19 vaccination clinic hosted by the Black Doctors COVID-19 Consortium at Temple University's Liacouras Center in Philadelphia, Friday, Feb. 19, 2021. Efforts to vaccinate Americans against COVID-19 have been stymied by a series of winter storms and outages in parts of the country not used to extreme cold weather, and hobbled transportation hubs and highways. (AP Photo/Matt Rourke, File)
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