Some researchers question these results because they think the studies were poorly designed.

Now, some researchers question whether it will ever be possible to learn if the test saves lives.

Some doctors and researchers also questioned the effect the new recommendations might have on patients.

American researchers questioned the findings, which do not match results in this country.

Other researchers have questioned these findings and they remain controversial.

The researchers questioned the study participants and gave them memory tests for Alzheimer's.

But now some researchers and money managers are questioning this conventional wisdom.

The researchers questioned the practice, common in many studies, of lumping all sexual abuse together.

However, some researchers have questioned whether self-medication is really the best explanation for the association.