1. Bousquet J, Khaltaev N, Cruz AA, Denburg J, Fokkens WJ, Togias A, Zuberbier T, Baena-Cagnani CE, Canonica GW, van Weel C, et al. Allergic rhinitis and its impact on asthma (ARIA) 2008 update (in collaboration with the World Health Organization, GA(2)LEN and AllerGen). Allergy. 2008;63(Suppl 86):8–160.
2. Fokkens WJ, Lund VJ, Mullol J, Bachert C, Alobid I, Baroody F, Cohen N, Cervin A, Douglas R, Gevaert P et al: European Position Paper on Rhinosinusitis and Nasal Polyps 2012. Rhinol Suppl 2012(23):3 p preceding table of contents, 1–298.
3. Pawankar R, Canonica R, Holgate S, Lockey R, Blaiss M. World allergy organisation (WAO) white book on allergy: update 2013. Milwaukee: World Allergy Organization; 2013.
4. Keith PK, Desrosiers M, Laister T, Schellenberg RR, Waserman S. The burden of allergic rhinitis (AR) in Canada: perspectives of physicians and patients. Allergy Asthma Clin Immunol. 2012;8(1):7.
5. Pawankar R, Canonica G, Holgate S, Loceky R. World Allergy Organisation (WAO): White book on allergy. Wisconsin: World Allergy Organisation; 2011. Available online at: http://www.worldallergy.org/UserFiles/file/WAO-White-Book-on-Allergy_web.pdf .