Kazuma Nagata, Susumu Sato, Kiyoshi Uemasu, Naoya Tanabe, Atsuyasu Sato, Shigeo Muro, Toyohiro Hirai. "Trajectory of the arterial-alveolar oxygen gradient in COPD for a decade." PLoS ONE, 2025. doi:10.1371/journal.pone.0318377