Reassessing anaemia in gastrectomy: Diagnostic definitions and predictive value in the POWER 4 cohort. (Ripolles-Melchor J, Abad-Motos A, Nieto Moreno E, Jerico C, Otero-Martínez I, Abdel-Lah Fernández O, García-Alvarez R, Tormos-Pérez MP, Espinosa AV, Aldecoa C, Abad-Gurumeta A, Colomina MJ, García-Erce JA, POWER 4 Investigators Group) Rev Esp Anestesiol Reanim (Engl Ed) 2026 Feb;73(2):502020 PMID: 41621750 02/02/2026