I am sorry to say that under virtually all conceivable factual circumstances, any claim for medical negligence has passed during the twenty years since these events.
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Your mom needs to contact a medical malpractice attorney for a consultation immediately. If you are doing it on behalf of your mom, you will not get medical records because of HIPPA laws; and not all records are provided to patients upon their request. An attorney will evaluate the case and gather records for review.
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