Patient safety management systems and activities related to promoting voluntary in-hospital reporting and mandatory national-level reporting for patient safety issues: A cross-sectional study. - Fujita, Shigeru; Seto, Kanako; Hatakeyama, Yosuke; Onishi, Ryo; Matsumoto, Kunichika; Nagai, Yoji; Iida, Shuhei; Hirao, Tomohiro; Ayuzawa, Junko; Shimamori, Yoshiko; Hasegawa, Tomonori (PLoS ONE, 2021)