Hiroaki Ogata, Kazuya Tsubouchi, Tomotsugu Takano, Katsuyuki Ichiki, Ryo Torii, Shohei Takata, Noriaki Nakagaki, Makoto Yoshida, Yasuhiko Kitasato, Kazunori Tobino, Eiji Harada, Hiroshi Wataya, Hiroshi Ishii, Takashige Maeyama, Masayuki Kawasaki, Masaki Fujita, Kazuhiro Yatera, Yoshiaki Zaizen, Yoichi Nakanishi, Isamu Okamoto. "Mortality and exacerbation risk according to GOLD and STAR severity stages of COPD: a 5-year multicenter prospective cohort study." Scientific Reports, 2025. doi:10.1038/s41598-025-05033-w