Association between ICU-level variation in arterial blood gas utilization and in-hospital mortality: A retrospective cohort study using the Japanese Intensive care PAtient Database registry - Shunsuke Yawata; Shigehiko Uchino; Seiichi Yamashima; Seiya Nishiyama; Shohei Ono; Yusuke Sasabuchi; Shinshu Katayama (PLoS ONE, 2026)