| http://www.w3.org/ns/prov#value | - In groups of patients with medically unexplained symptoms such as chronic back pain and chronic dizziness, 66% of patients have a history of recurrent major depression compared to less than 20% of control groups with medically explained symptoms (Atkinson et al. 1991; Katon and Sullivan 1990; Sullivan and Katon 1993).
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