Methodology for research and scientific publication in pediatrics. Main methodological designs Begoña Pérez-Moneo; M. Jesús Esparza Olcina; Sergio Flores Villar; Carolina Blanco Rodríguez; M. Victoria Martínez Rubio; Manuel Molina Arias;

Frequency, risk and impact measures in epidemiology Carlos Ochoa Sangrador; Eduardo Ortega Páez; Manuel Molina Arias; Fernando Carvajal Encina; Eduardo Cuestas Montañes;

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;