We included only risk factors that could be addressed by interventions or public policy. We focused on risk factors to which children are exposed from birth (and in utero) up to 5 years of age and that affect large numbers of young children in developing countries.
Both associational studies and studies that allow greater inference of causality (eg, intervention studies) were reviewed. We used multiple search terms to search relevant databases (eg, PubMed, PsychInfo). We also reviewed