Are the psychological tests valid?
Ernesto
E
Pollitt
D002657:Child Development / Q000187:drug effects*; D019587:Dietary Supplements; D006801:Humans; D007223:Infant; D019266:Iron, Dietary / Q000494:pharmacology*; D011594:Psychometrics; D015203:Reproducibility of Results; D015032:Zinc / Q000008:administration & dosage / Q000494:pharmacology*
D019266:Iron, Dietary; D015032:Zinc