But according to the early findings of two studies, the changes do not appear to have had such dire effects across the country.
But the early findings suggested that it could be a problem.
But it would be wrong to make too much of these early findings, researchers caution.
But later studies failed to back up those earlier findings.
He had held back from acting on the Project's early findings.
But agency officials say the early findings may be the result of chance.
But further study is necessary to confirm these early findings.
Its developers say it needs further study in many more women to determine whether the early findings hold up.
But there are two conclusions that challenge earlier findings by the agency.
Still, other researchers are picking up on the early findings.