A prospective study involving 1,544 patients who had annual physical examinations during a one-year period was conducted to determine the incidence of thyroid abnormalities in a practice of general internal medicine. A total of 5.8% abnormalities were found including nodular disease, thyroiditis, Graves' disease, hypothyroidism, simple goiter, and iatrogenic hyperthyroidism. No thyroid cancer was detected. (JAMA239:742-744, 1978)
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D. B. Baldwin (1978) studied this question.
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