11.   Afraid to take fen-phen, now that a medical study has linked the diet drug to heart and lung damage?

12.   But fen-phen was yanked off the market in September after a Florida study linked heart-valve problems with one of the fen-phen drugs.

13.   Earlier studies had linked a low intake of selenium to an increased risk of developing heart attacks, strokes and other diseases related to high blood pressure.

14.   Earlier studies had linked low dietary intakes of selenium to an elevated risk of heart attacks, strokes and other diseases related to high blood pressure.

15.   Last year, a Johns Hopkins University study linked air pollution to increased mortality from cardiac and respiratory diseases.

16.   Local health and environmental officials said that, so far, studies had not linked particular ailments in residents to the high lead and mercury levels around the plant.

17.   Mark found that many studies linked arsenic contamination and neural-tube birth defects, such as anencephaly and spina bifida.

18.   Neuroblastoma has been linked to exposure to toxins, but studies did not link the Morgan City cluster directly to emissions from Marine Shale.

19.   No studies directly link cell phone use to brain cancer.

20.   No serious study has ever linked declines in murder with capital punishment.