| http://www.w3.org/ns/prov#value | - However, there are a few visible signs associated with these cancers that require immediate attention, including: Red or white patches in the mouth that last more than two weeks Change in voice or hoarseness that lasts more than two weeks Sore throat that does not subside Pain or swelling in the mouth or neck that does not subside Lump in the neck Ear pain Difficulty speaking or swallowing Difficu
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