title: Safety and immunogenicity of a fully liquid vaccine containing five-component pertussis-diphtheria-tetanus-inactivated poliomyelitis-Haemophilus influenzae type b conjugate vaccines administered at two, four, six and 18 months of age.
keywords: Acellular pertussis vaccine; Combination vaccine; Diphtheria toxoid; Haemophilus influenzae type b conjugate vaccine; Inactivated polio vaccine; Tetanus toxoid