Encara no tenim significats per a "ascertained via".
1Dietary information was ascertained via a food frequency questionnaire mailed to participants in 1986.
2It is ascertained via history, examination and investigations, and a primary aim is diagnosis.
3The study included 4081 controls ascertained via random-digit telephone dialing.
4We studied seven multiplex kindreds ascertained via an index case with a nonsyndromic solitary kidney or renal hypodysplasia.
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