Functional gastrointestinal disorders frequency by Rome IV criteria Claudia Alonso-Bermejo; Josefa Barrio; Beatriz Fernández; Elena García-Ochoa; Almudena Santos; Marta Herreros; Cristina Pérez;

Pediatric virtual visits: experiences, preferences, and expectations of patients and caregivers Miren Ibarzabal Arregi; Tregony Simoneau; Jonathan M. Gaffin; María Gimeno Castillo; Isabel Castro Garrido; Claudia María Chaverri Reparaz; Laura Moreno-Galarraga;

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