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In page Gail Devers:

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In 1990, she was diagnosed with Graves' disease and underwent radioactive iodine treatment followed by thyroid hormone replacement therapy.[citation needed] During her radiation treatment, Devers began to develop blistering and swelling of her feet. Eventually, she could barely walk. Devers recovered after the radiation treatment was discontinued, and she resumed training. At the 1991 World Championships, she won a silver medal in the 100 m hurdles.