Promoting Empathy and Affiliation in Relationships (PEAR) study: protocol for a longitudinal study investigating the development of early childhood callous-unemotional traits by Nicholas Wagner, Emily Perkins, Yuheiry Rodriguez, Cora Ordway, Michaela Flum, Lucia Hernandez-Pena, Polina Perelstein, Kathy Sem, Yael Paz, Rista Plate, Ayomide Popoola, Sarah Lynch, Kristina Astone, Ethan Goldstein, Wanjikũ F M Njoroge, Adriane Raine, Donna Pincus, Koraly Pérez-Edgar, Rebecca Waller

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