Kong, A., Thorleifsson, G., Frigge, M., Vilhjalmsson, B., Young, A., Thorgeirsson, T., … Stefansson, K. (2018). The nature of nurture: Effects of parental genotypes. Science (New York, N.Y.), 359(6374), 424-428. https://doi.org/10.1126/science.aan6877 (Original work published 2018)