Some scientists and researchers have expressed skepticism about the need for a social networking site.

Doctors and medical researchers are expressing concern that many clinical studies have never been published because they produced negative results.

Individual doctors and researchers express a range of opinions.

Thankfully, few researchers (or parents) would express such views today.

But one environmental researcher expressed caution today about the study's conclusions.

But some researchers expressed caution about the new findings.

Despite their optimism, researchers expressed some reservations about the procedure.

Other researchers expressed skepticism about the significance of the findings and said much more research had to be done.

In this respect, we have to create the right conditions so that European researchers can best express themselves.

These researchers have expressed concerns about the appropriateness of traditional genre theory for new media communication.