FEDERA Salud: Early Adoption of SIMPL for Federated Health Data Spaces in Spain. - Bravo-Del-Cid P; Rey-Garduño F; Gonzalez-Lopez M; Rodríguez-Mejías S; Pulido-Cabello C; Granados-Delgado FJ; Alvarez-Romero C; Leal-Gonzalez S; Parra-Calderón CL (Studies in health technology and informatics, 2026)