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.