However, the evidence isn't clear and more research needs to be done.

She also said that further research needed to include women and other racial groups.

However, much more research needs to be done on this.

New drugs show promise, but more research needs to be done.

They also said that more research needed to be done.

More research needs to be done, but early studies suggest it may have a number of benefits.

Although these studies are promising, more research needs to be done.

I also think that research and development in this area need greater support.

The study's conclusion states that further research needs to be done.

The researchers said they were not sure how the process worked, and added that more research needed to be conducted.