Widespread covariation of early environmental exposures and trait-associated polygenic variation. Krapohl, E.; Hannigan, L. J.; Pingault, J.-B.; Patel, H.; Kadeva, N.; Curtis, C.; Breen, G.; Newhouse, S. J.; Eley, T. C.; O'Reilly, P. F.; Plomin, R.. Proceedings of the National Academy of Sciences of the United States of America. 2017; 11727-11732: p.11727-11732. doi:10.1073/pnas.1707178114Article