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In the United States, more than half of people living with a mental health disorder do not receive treatment, according to the National Institute of Mental Health, which is why primary-care clinics can play a leading role in depression care.

Research shows that collaborative care programs in which primary-care providers work with a manager and a designated psychiatric consultant can more than double the likelihood of improving outcomes. But a new study published in Health Affairs shows that not all care is equal.

Looking at data from 11,003 patients in 135 primary care