El Sawy, I. H., R. M. Wagdy, A. G. Ibrahim, and S. W. Ibrahim. “Risk Factors Associated With Severe Asthma Exacerbations in Children Attending Alexandria University Children’s Hospital, Egypt”. International Journal Of Community Medicine And Public Health, vol. 5, no. 12, Nov. 2018, pp. 5019-24, doi:10.18203/2394-6040.ijcmph20184670.