The role of new therapies must be determined in rigorous trials.

Many drugs show early promise but fizzle as more rigorous trials are done.

The exception is Prozac, for which there have been three rigorous trials.

Several of these substances have not been well studied in rigorous clinical trials.

But he said the results lay the groundwork for a new round of more rigorous trials.

But the instinct of the young sportsman was about to be put to a still more rigorous trial.

Data for the submission must come from rigorous clinical trials.

One doctor who has seen a final version of the study said it was the most rigorous trial on the subject to date.

Larger, more rigorous trials are needed to definitely determine whether this approach is effective.

After rigorous trials, he succeeds, but cannot stop himself from falling in love with Riddhima again.