2Asher MI,Montefort S,Bj(o)rkstén B,et al.Worldwide time trends in the prevalence of symptoms of asthma,allergic rhinoconjunctivitis,and eczema in childhood:ISAAC Phases One and Three repeat multicountry cross-sectional surveys.Lancet,2006,368:733-743.
3Kong WJ,Chen JJ,Zheng ZY,et al.Prevalence of allergic rhinitis in 3-6-year-old children in Wuhan of China.Clin Exp Allergy,2009,39:869-874.
4Eng PA,Reinhold M,Gnehm HP.Long-term efficacy of preseasonal grass pollen immunotherapy in children.Allergy,2002,57:306-312.
