Adaptation to San Martín Quechua and psychometric analysis of the Patient Health Questionnaire (PHQ-9) in Peruvian adults. - Cjuno J; Gomez-Hurtado H; Shupingahua-Jimenez C; Aranda-Turpo J; Julca Guerrero F; Velásquez-Castillo N; Anco EWA; Bazalar-Palacios J; Bazo-Alvarez JC (BMC psychology, 2026)