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Corresponding author: Mário Morais-Almeida, Allergy Centre, CUF
Descobertas Hospital, 1998-018 Lisboa, Portugal. E-mail:mmoraisalmeida@netcabo.pt.
Telephone: +351917232267.
Conflict of interest:None declared.
Support: No funding was received in the publication of this
letter.
Author’s contributions: MMA and MTB performed data analysis and
drafted the manuscript. CSS, RA and JB provided critical review. All
authors approved the final draft of the manuscript.