title: An elaboration of small opacity types (p, m, and n) in simple pneumoconiosis.
mesh_terms: D000704:Analysis of Variance; D003032:Coal Mining; D006801:Humans; D007390:International Agencies; D008168:Lung / Q000473:pathology; D008297:Male; D011009:Pneumoconiosis / Q000145:classification* / Q000000981:diagnostic imaging* / Q000473:pathology; D011859:Radiography