How useful is the Helen Keller food frequency chart in the determination of the vitamin A status in pregnancy?

Author: Eigbefoh JO   Okpere EE   Ande B   Asonye C  

Publisher: Informa Healthcare

ISSN: 1364-6893

Source: Journal of Obstetrics & Gynaecology, Vol.25, Iss.2, 2005-02, pp. : 123-127

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Abstract