Correction to: A Multimedia Adaptive Tutoring System for Mathematics that Addresses Cognition, Metacognition and Affect. - Arroyo, Ivon; Woolf, Beverly Park; Burleson, Winslow; Muldner, Kasia; Rai, Dovan; Tai, Minghui (International Journal of Artificial Intelligence in Education (Springer Science & Business Media B.V.), 2018)