title: Serum immunoglobulin levels in coal workers' pneumoconiosis.
mesh_terms: D003032:Coal Mining; D006801:Humans; D007136:Immunoglobulins / Q000032:analysis*; D008875:Middle Aged; D009787:Occupational Medicine; D011009:Pneumoconiosis / Q000276:immunology*
chemical_list: D007136:Immunoglobulins