Development, system design, safety, and performance metrics of a conversational agent for reducing depressive and anxious symptoms based on a large language model: The MHAI study - David Villarreal-Zegarra; Yscenia Paredes-Gonzales; Andrea Dámaso-Román; Judith Quiñones-Inga; Gianfranco Centeno-Terrazas; Yan Pieer Alexis-Montalban Lozada (PLoS ONE, 2026)