But scientists caution that there is still much to be learned about long-term side effects.

But scientists caution that the research is in its infancy.

But scientists cautioned that it was too soon to pass final judgment.

But scientists caution that the studies must be tried on hundreds more patients to validate them.

But scientists who conducted the study cautioned that the benefits would not be uniform.

The scientists cautioned that no verification system can be perfect.

Scientists caution that more data are needed to prove the effectiveness of the new technique.

Other scientists cautioned that the clinical relevance of the finding was far from clear.

But scientists, including the authors, cautioned that the results should be viewed as preliminary.

And scientists caution that because of Idaho's small population, such statistics are easily distorted.