Bottema RW, Nolte IM, Howard TD, Koppelman GH, Dubois AE, de Meer G, Kerkhof M, Bleecker ER, Meyers DA, Postma DS. Interleukin 13 and interleukin 4 receptor-a polymorphisms in rhinitis and asthma. Int Arch Allergy Immunol. 2010; 153(3):259-67.