The only way to know for sure was to do a large study like the current one.

Such side effects were reported by 2.4 percent of patients in one large study.

It was the agency's first large study on the issue since 1988.

No large studies have been done to test this treatment.

A large study followed children born between 22 and 25 weeks until the age of 6 years old.

But another reason may be that they have run out of money, a large study suggests.

At least four other large studies have had similar findings.

She plans a larger study, and says it isn't clear what the average weight of a 19-year-old should be.

The latest drugs were very new, and large studies had yet to be done.

The largest and best studies have only included a few hundred people.