title: IgG4 deficiency and recurrent respiratory infections.
authors.forename: A
authors.initials: A
authors.lastname: Etzioni
mesh_terms: D002648:Child; D003627:Data Interpretation, Statistical; D006801:Humans; D017099:IgG Deficiency; D012008:Recurrence; D012141:Respiratory Tract Infections / Q000276:immunology*