Critical appraisal (I): Fundamentals, tools, and application to scientific articles on outcomes and harmful effects Javier González de Dios; María Salomé Albi Rodríguez; Álvaro Gimeno Díaz de Atauri; Laura Cabrera Morente; Elena Pérez González; Carlos Ochoa Sangrador;

Evidence-based medicine: 5 steps to navigate uncertainty Rafael Martín-Masot; Carlos Ochoa Sangrador; Jaime Javier Cuervo Valdés; Carolina Blanco Rodríguez; Paz González Rodríguez; Javier González de Dios;

Cross-cultural adaptation and validation of the pediatric difficult intravenous access (DIVA) prediction score in Spain María de la Vieja-Soriano; Ignacio Zaragoza-García; Alberto Galindo-Muñoz; Ismael Ortuño-Soriano; Mónica Blanco-Daza; María Domínguez-Muñoz; Oscar Arrogante Maroto;