Allergic Rhinitis and its Impact on Asthma (ARIA) 2008 Update (in collaboration with the World Health Organization, GA²LEN and AllerGen ) - Bousquet, J; Khaltaev, N; Cruz, A.A; Denburg, J; Fokkens, W.J; Togias, A; Zuberbier, T; Baena-Cagnani, C.E; Canonica, G.W; van Weel, C; Agache, I; Aït-Khaled, N; et al. (Allergy (Copenhagen), 2008)