Main changes in the “COVID-19 in paediatrics” clinical practice guideline Javier González de Dios, Victoria Martínez Rubio, Álvaro Giménez Díaz de Atauri, Carlos Ochoa Sangrador, Enrique Rodríguez-Salinas Pérez, Sergio Flores Villar, Jaime Javier Cuervo Valdés

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