The scientists reviewed the cases of 40 people whose brains - studied after autopsy - showed they had Alzheimer's disease.

The extra time will allow scientists to review the health of the fish and to further assess a count botched two years ago.

In response to a question, the authors would not say whether any other scientists had reviewed their methods or conclusions.

Canadian scientists reviewed unpublished data from the study and found health effects that had not been cited in the Science report.

He said independent scientists had reviewed the institutes' protocol and believed no significant data could be gained from the euthanasia studies.

A scientist reviews efforts to create a unified theory of the universe.

A certifying scientist reviews the result and sends it to an authorized physician.

Each month, the independent scientists reviewed data from the trial comparing the effects of the two treatments.

In a more recent 2006 study, scientists reviewed and advocated these earlier proposed ideas.

The scientists then reviewed the death certificates for the 2,418 women who died from 1981 to 1992 to find out which had Alzheimer's.