title: [Discussing the choice of controls prevention and treatment].
authors.forename: B
authors.initials: B
authors.lastname: Dong
authors.forename: S
authors.initials: S
authors.lastname: Zheng
authors.forename: M
authors.initials: M
authors.lastname: Xiao
mesh_terms: D018849:Controlled Clinical Trials as Topic; D018592:Cross-Over Studies; D006801:Humans; D016032:Randomized Controlled Trials as Topic; D012140:Respiratory Tract Diseases / Q000517:prevention & control*