Urban air pollution and hospital admissions for asthma and acute respiratory disease in Murcia city (Spain) Juan Antonio Ortega-García; Indra Martínez-Hernández; Elena Boldo; Alberto Cárceles-Álvarez; Carmen Solano-Navarro; Rebeca Ramis; Estefanía Aguilar-Ros; Manuel Sánchez-Solis; Fernando López-Hernández;

Clinical characteristics and mortality risk factors in patients aged less than 18 years with COVID-19 in Mexico and Mexico City Rosa María Wong-Chew; Daniel Ernesto Noyola; Antonio Rafael Villa;

Epidemiology and risk factors for bronchopulmonary dysplasia in preterm infants born at or less than 32 weeks of gestation Andrea Sucasas Alonso; Sonia Pértega Diaz; Rebeca Sáez Soto; Alejandro Avila-Alvarez;