title: Coming: a 'Dear Doctor' letter that you may want to ponder.
mesh_terms: D001241:Aspirin / Q000008:administration & dosage*; D002318:Cardiovascular Diseases / Q000517:prevention & control*; D002338:Carotenoids / Q000008:administration & dosage*; D002986:Clinical Trials as Topic; D004311:Double-Blind Method; D006801:Humans; D008175:Lung Neoplasms / Q000517:prevention & control*; D011446:Prospective Studies; D019207:beta Carotene
chemical_list: D019207:beta Carotene; D002338:Carotenoids; D001241:Aspirin