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Prevalence of wheezing any time in the past and wheezing in the past 12 months in children (6–7 years) from northern Mexico City. ISAAC (2003) vs. GAN (2017). *WHEZEV: Wheezing or whistling in the chest at any time in the past. +WHEZ12: Wheezing or whistling in the chest in the past 12 months. ** Chi2 Fisher Test
