Respiratory Sinus Arrhythmia and Heart Period in Infancy as Correlates of Later Oppositional Defiant and Callous-Unemotional Behaviors - Wagner, Nicholas; Mills-Koonce, Roger; Willoughby, Michael; Propper, Cathi; Rehder, Peter; Gueron-Sela, Noa (International Journal of Behavioral Development, 2017)