Wagner N, Perkins E, Rodriguez Y, Ordway C, Flum M, Hernandez-Pena L, Perelstein P, Sem K, Paz Y, Plate R, Popoola A, Lynch S, Astone K, Goldstein E, Njoroge W, Raine A, Pincus D, Pérez-Edgar K, Waller R. Promoting Empathy and Affiliation in Relationships (PEAR) study: protocol for a longitudinal study investigating the development of early childhood callous-unemotional traits. BMJ Open 2023, 13: e072742. PMID: 37802613, PMCID: PMC10565261, DOI: 10.1136/bmjopen-2023-072742.Peer-Reviewed Original Research