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 - Aya Sugiyama; Toshiro Takafuta; Kanon Abe; Yayoi Yoshinaga; Ko Ko; Tomoki Sato; Tomoyuki Akita; Masao Kuwabara; Shingo Fukuma; Junko Tanaka (PLoS ONE, 2026)