31.   Previous studies have linked clinical depression with shorter survivability.

32.   Previous studies have linked deaths and heart attacks to some short-acting calcium channel blockers in the same sub-class as isradipine.

33.   Previous studies have linked the stress of racism to an added risk of hypertension for blacks, who are more likely than whites to suffer from the illness.

34.   Recent epidemiological studies link fine particles of soot to large numbers of premature deaths and respiratory and cardiovascular illnesses, particularly among the elderly.

35.   Recent studies have linked high blood levels of an amino acid called homocysteine with an increased risk of developing coronary disease as serious as that associated with high cholesterol.

36.   Previous studies have linked trans fatty acids to an increased risk of heart disease.

37.   Robert Kraut, co-author of a new study linking depression with Internet use, sounded a bit depressed himself last week.

38.   Several epidemiological studies link fine particles to large numbers of premature deaths and respiratory and cardiovascular illnesses, particularly among the elderly.

39.   Several studies have linked fish-eating to reduced rates of sudden death from heart disease, and the more fish the better.

40.   Soon after, however, another study linked heavy coffee consumption to bladder cancer in nonsmokers.