21.   Important exceptions, however, include people with other conditions like atrial fibrillation, the heart rhythm disorder, in which warfarin has been proved more effective than aspirin.

22.   Last week, independent studies showed evidence that Avonex proved more effective than previously anticipated.

23.   Nor has the drug been proven effective for preventing the flu.

24.   Researchers say the screening test, if it is proved effective, may pinpoint young women at risk who would never have considered amniocentesis.

25.   Residents fondly recall the U.S. Public Health Service administrators who lifted penallike restrictions that persisted years after sulfone drugs proved effective.

26.   Similar technology has already been proved effective for other uses, such as automatic toll collection.

27.   So that AIDS drug -- which has yet to be proven effective -- had better work.

28.   So far, thalidomide has been proven effective in controlling at least one cancer, multiple myeloma.

29.   The Journal was the first major newspaper to report that new drugs called protease inhibitors had proved surprisingly effective against AIDS.

30.   The scientist in Fredi Kronenberg thinks it is likely to be proved effective.