21.   Khan cautioned that much longer follow-up will be needed to know if the valve damage causes ill effects later in life.

22.   Lawyers had argued that American Home hid evidence that its diet drugs caused heart valve damage.

23.   Such reports cannot prove that the diet pills actually caused the valve damage.

24.   That was when the U.S. Food and Drug Administration pushed for their withdrawal after a Mayo Clinic study linked the drugs to potentially fatal heart valve damage.

25.   The Mayo Clinic had collected information from patients who had developed heart valve damage after taking the drugs.

26.   The results showed no significant difference in the three groups in the kind of serious valve damage that the FDA had warned of in Redux patients.