![photo-1475178278683-8c225ae5ec3e](https://www.nationalelfservice.net/cms/wp-content/uploads/2016/11/photo-1475178278683-8c225ae5ec3e-150x150.jpeg)
Alan Underwood summarises a population based cohort study of 2.4 million Swedish children, which highlights links between perinatal risk factors such as smoking during pregnancy, and later development of obsessive compulsive disorder.
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