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Posteroanterior views of the chest showing (left) bilateral hilar adenopathy, indicative of stage I sarcoidosis, and (center) stage III sarcoidosis, and (right) single view of the chest showing stage IV sarcoidosis. | Wu, J. J., & Schiff, K. R. (2004). Sarcoidosis. American family physician, 70(2), 312–322.

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