title: Combined and simultaneously administered vaccines. A brief history.
authors.affiliation: Parkman Associates, Kensington, Maryland 20895, USA.
authors.forename: P D
authors.initials: PD
authors.lastname: Parkman
mesh_terms: D003140:Communicable Disease Control / Q000379:methods*; D049673:History, 20th Century; D006801:Humans; D007115:Immunization Schedule; D007223:Infant; D007231:Infant, Newborn; D014481:United States; D014612:Vaccines / Q000008:administration & dosage* / Q000266:history* / Q000276:immunology / Q000592:standards; D017778:Vaccines, Combined / Q000266:history* / Q000276:immunology / Q000592:standards
chemical_list: D014612:Vaccines; D017778:Vaccines, Combined