The attack rate of progressive massive fibrosis.
D001699:Biometry; D003032:Coal Mining; D006801:Humans; D015994:Incidence; D011009:Pneumoconiosis / Q000150:complications*; D011658:Pulmonary Fibrosis / Q000706:statistics & numerical data*
COAL MINING; PNEUMOCONIOSIS/complications; PULMONARY FIBROSIS/statistics