1. Department of Allergology, Hospital Universitario de Basurto, Bilbao, Spain
2. Section of Allergology, Hospital Universitario Germans Trias Pujol, Badalona, Spain
3. Department of Allergology, Hospital Universitario Araba, Vitoria, Spain
4. Department of Allergology, Hospital Universitari de Bellvitge, L’Hospitalet de Llobregat, Spain
5. Department of Allergology, Hospital Universitario Marqués de Valdecilla, Santander, Spain
6. Department of RD, ROXALL Medicina España S.A., Zamudio, Spain