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The central laboratory has a valid certification for the performance of these assays following international guidelines.
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The site has a valid SSL certificate -- so the lock icon in your browser will go green to mark it "safe" -- and a handful of security certification images are thrown in for good measure (including Verisign and Symantec).
For example if you have completed nursing certification in Denver, then make sure that you possess a valid certification and license from the same state.
But they charge that Mr. Rinaldi, 57, and Mrs. Rinaldi, 65, who at one time had operated with a valid certification, forged insurance certificates to renew their license from the State Department of Labor.
N.Y.C. has a valid claim to Paine.
He has a valid point there.
Rudi Edsall has a valid question.
But it has a valid role.
This source has a valid point.
I believe he has a valid point.
A participant had to: be at least 18 years of age; have a valid diver certification; be planning to dive the day of their recruitment; be deemed fit for diving by the dive operator; and have working knowledge of English.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com