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All lobes were involved; the RML (69%) was involved most and the upper division of the LUL (44%) was involved least. Except for the lower lobes, the other lobes were involved to a greater extent in NTM than in subjects without NTM. LUL =left upper lobe; NTM = nontuberculous mycobacteria; RLL = right lower lobe; RML = right middle lobe; RUL = right upper lobe.
