A safe delivery system to prevent COVID-19 transmission without negative-pressure isolation delivery rooms: Experience from a hospital with nosocomial outbreak - Yoshifumi Kasuga; Daigo Ochiai; Masumi Tamagawa; Maki Oishi; Toyohide Endo; Yu Sato; Miho Iida; Satoru Ikenoue; Mamoru Tanaka (Taiwanese Journal of Obstetrics & Gynecology, 2021)