Sherri Willis-Prater's baby boy was 2 months old, and she was about to return to her job at a school cafeteria in Chicago.But as she walked up the short flight of stairs to her kitchen one evening, she nearly collapsed, gasping for breath.At the hospital, Ms. Willis-Prater, who was 42 at the time, was connected to a ventilator that pumped air into her lungs.
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