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The effects of PM2.5 on asthmatic and allergic diseases or symptoms in preschool children of six Chinese cities, based on China, Children, Homes and Health (CCHH) project

AsthmaEnvironmental AllergyChinese CitiesAllergyPreschool ChildrenAllergy MedicineEnvironmental HealthPediatricsAir QualityAir PollutionParticulate MatterMedicineAllergic Diseases