Frailty as a Key Determinant of In-Hospital Mortality in 58,040 Patients with Community-Acquired Pneumonia: Evidence from a Chilean Cohort. - Concha-Cisternas, Yeny; Vásquez-Muñoz, Manuel; Yañez-Sepúlveda, Rodrigo; Sazo-Rodríguez, Sergio; Diaz Canales, Felipe; Fuentes Orellana, Christopher; Schonffeldt, Patricia; Guzmán-Muñoz, Eduardo (Journal of Clinical Medicine, 2026)