title: IgG subclasses in children with chronic chest symptoms.
mesh_terms: D000375:Aging; D001991:Bronchitis / Q000150:complications / Q000276:immunology*; D002648:Child; D002675:Child, Preschool; D002908:Chronic Disease; D004406:Dysgammaglobulinemia / Q000145:classification* / Q000276:immunology; D006801:Humans; D017099:IgG Deficiency; D007074:Immunoglobulin G / Q000032:analysis / Q000145:classification; D007223:Infant; D012016:Reference Values
chemical_list: D007074:Immunoglobulin G