Environmental Rather than Genetic Factors Determine the Variation in the Age of the Infancy to Childhood Transition: A Twins Study by German, Alina, MD, Livshits, Gregory, PhD, Peter, Inga, PhD, Malkin, Ida, PhD, Dubnov, Jonathan, MD, Akons, Hannah, MD, Shmoish, Michael, PhD, Hochberg, Ze'ev, MD, PhD

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