By John Torres, M.D. and Felix Gussone, MD

This week, millions of Americans are going to experience temperatures their generation has never seen before — a life-threatening polar vortex sweeping across the country. Some places, like Chicago, are bracing for temperatures as low as -20 F and brutal wind chills of -50 F. At least 75 million Americans in the East, Midwest and Deep South are facing an arctic blast.

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