Factors underlying COVID-19 vaccine and booster hesitancy and refusal, and incentivizing vaccine adoption.

The paper investigates the factors underlying COVID-19 vaccine and booster hesitancy in the United States, and the efficacy of various incentives or disincentives to expand uptake. We use cross-sectional, national survey data on 3,497 U.S.

Twin differences in birth weight: the effects of genotype and prenatal environment on neonatal and post-neonatal mortality.

There is much evidence to suggest that both genes and prenatal environment influence life chances. However, recent within-twin estimates also raise questions about how the influence of genes and prenatal environment may vary across different subgroups of a population and over time. This paper explores such potential variation within the 1st year of life.