English translation: proven; verified; come to pass
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Explanation: However, the association of these two techniques has not been established (or corroborated).
Notice that the original has an error: the subject of the sentence is "a associação dessas duas técnicas", which is singular. Therefore, it should say "não foi comprovada". The above translation takes care of this.
Webster's Electronic Dictionary
rhandler Local time: 08:01 Native speaker of: Portuguese PRO pts in pair: 7949