Differential clinic in children infected by SARS-CoV-2, traceability of contacts and cost-effectiveness of diagnostic tests: Cross-sectional observational study Antia Fiel-Ozores; María Luisa González-Durán; Reyes Novoa-Carballal; María del Mar Portugués-de la Red; Isabel Fernández-Pinilla; Jorge Julio Cabrera-Alvargonzález; Cristina Martínez-Reglero; Sonia Rey-Cao; Ana Concheiro-Guisán;

Narrative review of the immune response against coronavirus: An overview, applicability for SARS-COV-2, and therapeutic implications Alberto García-Salido;

Recommendations for the perinatal management and follow-up of moderate and late preterm infants Sílvia Martínez-Nadal; Gemma Ginovart Galiana; Félix Morales Luengo; María Jesús Rodríguez Revuelta; Mercedes García Reymundo; Sara Ansó Oliván; José Antonio Hurtado Suazo;