Authors’ contribution
Francisco Vega conducted the prospective study, participated in all
stages of the study and wrote the first draft of the article.
Azahara Lopez-Raigada y M. Victoria Mugica collaborated to perform
skin-tests and drug challenge-tests.
Carlos Blanco coordinated the whole study
All authors have been involved in drafting the manuscript or revising it
critically for important intellectual content, and also, they have given
final approval of the version to be published.