Coal smoke and mortality of the elderly.
D000059:Accidents; D000367:Age Factors; D000368:Aged; D001991:Bronchitis / Q000401:mortality; D003031:Coal; D005260:Female; D005264:Femoral Fractures / Q000401:mortality; D050723:Fractures, Bone / Q000401:mortality; D006801:Humans; D008297:Male; D009026:Mortality; D012737:Sex Factors; D012906:Smoke
D003031:Coal; D012906:Smoke