Differences in the long-term course of post-COVID-19 symptoms in adults and children across epidemic periods: A retrospective cohort study in Japan, 2020–2024. - Sugiyama, Aya; Takafuta, Toshiro; Abe, Kanon; Yoshinaga, Yayoi; Ko, Ko; Sato, Tomoki; Akita, Tomoyuki; Kuwabara, Masao; Fukuma, Shingo; Tanaka, Junko (PLoS ONE, 2026)