Should any form of alternative medicine be confirmed by valid studies, it would no longer be alternative but mainstream.

So, until some valid study like this is done, we should stop speculating.

Some people are not sure of how valid and credible the study was, but say that psychiatric diagnoses need to be improved.

There are no valid randomised comparative studies of surveillance versus treatment.

At least 800 patients would be needed for a valid study, Mr. Murphy said.

After the disclosure, the agency ordered companies to replace the Industrial Bio-Test data with valid studies.

Although the literature highlights various therapeutic options, few reports present any valid comparative studies.

Users' guides to the medical literature, II: how to use an article about therapy or prevention, A: are the results of the study valid?

A. Are the results of the study valid?

And there are no valid studies that answer the question of what is best for children, he said.