利用pubmed简单检索,检索2018年发表的关于2-5岁学龄前儿童哮喘的综述文献,前2篇标题是 A: SentinelAmenableMortality:ANewWaytoAssesstheQualityofHealthcarebyExaminingCausesofPrematureDeathforWhichHighlyEfficaciousMedicalInterventionsAreAvailable. B: Antibioticsforprolongedwetcoughinchildren. C: Istheatopicmarchrelatedtoconfoundingbygeneticsandearly-lifeenvironment?Asystematic review ofsibshipandtwindata. D: Systematic review ofpediatrichealthoutcomesassociatedwithchildhoodadversity.