Psychometric properties of the positivity scale in a Latin American sample: positivity as a unidimensional personality variable. - Aragón JM; Moreno-Jiménez B; Juárez-Rodríguez P; Yeo-Ayala C; Restrepo JE; Kobayashi-Gutiérrez A; de Los Milagros Cassaretto Bardales M; Meda-Lara RM (BMC psychology, 2026)