Sumathipala, A., Yelland, L., Green, D., Shepherd, T., Jayaweera, K., Ferreira, P., & Craig, J. M. (2017). Twins as Participants in Randomized Controlled Trials: A Review of Published Literature. Twin Research and Human Genetics, 21(1), 51-56. https://doi.org/10.1017/thg.2017.67