Comparison of the immunogenicity and safety of polysaccharide and protein-conjugated pneumococcal vaccines among the elderly aged 80 years or older in Japan: An open-labeled randomized study

Ho Namkoong, Yohei Funatsu, Kazunori Oishi, Yukihiro Akeda, Rika Hiraoka, Kei Takeshita, Takahiro Asami, Kazuma Yagi, Yoshifumi Kimizuka, Makoto Ishii, Sadatomo Tasaka, Yukio Suzuki, Satoshi Iwata, Tomoko Betsuyaku, Naoki Hasegawa