A version of this story appears in the September 2020 issue of National Geographic magazine. Philadelphia detected its first case of a deadly, fast-spreading strain of influenza on September 17, 1918.
2 University of Antioquia, Faculty of Medicine, Sports Medicine, Medellín, Colombia 3 University of Antioquia, Faculty of Medicine, Physiology, Medellín, Colombia The relationship between force and ...
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