Validation of a Measurement Model to Identify Socio-emotional Difficulties in Preschool Children: The Preschool Pediatric Symptom Checklist—Chilean Version. - Leiva, Loreto; Antivilo-Bruna, Andrés; Peña, Felipe; Scquicciarini, Ana María; Simonsohn, Ariela; Perrin, Ellen; Murphy, J. Michael (Child Psychiatry & Human Development, 2026)