Authors:
Ontoso, IA
Pena, AA
Bellido, J
Grima, FG
Varela, MMS
Citation: Ia. Ontoso et al., The prevalence of symptoms related to asthma in children from 13-14 years of age in 9 Spanish cities. ISAAC (International Study of Asthma and Allergies in Childhood) study, MED CLIN, 112(5), 1999, pp. 171-175