Retrospective study of acute mastoiditis in children in Spain attended in a Pediatric Emergency department Paula García-Sánchez; Belén Parra Rodríguez; Rosario López López; Miguel Ángel Molina Gutiérrez; Marta Bueno Barriocanal; María de Ceano-Vivas la Calle;

Respiratory syncytial virus outbreak during the COVID-19 pandemic. How has it changed? Lucía Hernández-Rivas; Teresa Pedraz; Cristina Calvo; Isabel San Juan; M.ª José Mellado; Ana Robustillo;

Unsuccessful tuberculosis-treatment in HIV-positive patients and associated factors Guillermo Bosch; Joan-Pau Millet; Àngels Orcau; Isabel Moreira; Carles Pericas; Lluïsa Forns; Isabel Marcos; Raquel Prieto; Anna Hernandez; Lídia Arranz; Cristina Rius;