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In page Maria Callas:

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A 2010 study by Italian vocal researchers Franco Fussi and Nico Paolillo revealed Callas was very ill at the time of her death and her illness was related to her vocal deterioration. According to their findings, presented at the University of Bologna in 2010, Callas had dermatomyositis, a rare, connective tissue disease that causes a failure of the muscles and ligaments, including the larynx. They believe she was showing signs of this disease as early as the 1960s. Fussi and Paolillo cite an initial report by physician Mario Giacovazzo, who in 2002 revealed he had diagnosed Callas with dermatomyositis in 1975. Treatment included corticosteroids and immunosuppressive agents, which affect heart function.[citation needed]