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In page Non-specific interstitial pneumonia:
"It has been suggested that idiopathic nonspecific interstitial pneumonia has an autoimmune mechanism, and is a possible complication of undifferentiated connective tissue disease,[1] however not enough research has been done at this time to find a cause. Patients with NSIP will often have other unrelated lung diseases like COPD or emphysema, along with other auto-immune disorders.
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