Keller, P. S., El-Sheikh, M., Vaughn, B., & Granger, D. A. (2010). Relations between mucosal immunity and children's mental health: the role of child sex. Physiology & Behavior, 101(5), 705-12. https://doi.org/10.1016/j.physbeh.2010.08.012 (Original work published 2010)