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Shirley Ardell Mason, American psychiatric patient (died 1998)

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Shirley Ardell Mason
American art teacher (1923–1998)
Shirley Ardell Mason was an American art teacher who was reported to have dissociative identity disorder. Her life was purportedly described, with adaptations to protect her anonymity, in 1973 in the book Sybil, subtitled The True Story of a Woman Possessed by 16 Separate…Source: Wikipedia (CC BY-SA)
Psychiatry
Branch of medicine devoted to mental disorders
Psychiatry is the medical specialty devoted to the diagnosis, treatment, and prevention of deleterious mental conditions. These include matters related to cognition, perceptions, mood, emotion, and behavior.Source: Wikipedia (CC BY-SA)