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, Maria Catala and M. Victoria Mugica collaborated to perform skin-tests and drug provocation-tests.
Marina Soria performed the statistical study and data analysis.
Carlos Blanco-Mota collected and reviewed the medical histories
Carlos Blanco coordinated the whole study
All authors revised the article critically and approved the final version to be published.