Lower Firmicutes abundance in gut microbiota associated with amyloid-β positivity in older adults in Japan as assessed by positron emission tomography - Narumi Kojima; Yosuke Osuka; Hiroyuki Sasai; Shoji Shinkai; Kenji Ishii; Noriyuki Kohda; Yodai Kobayashi; Hunkyung Kim (PLoS ONE, 2025)