Sakamoto, Naoya, Masayuki Ota, Tomoko Takeda, Atsushi Kosaka, Takuya Washino, Sentaro Iwabuchi, Minako Beppu, et al. 2022. “Nosocomial Outbreak of Coronavirus Disease in Two General Wards During the Initial Wave of the Pandemic in 2020, Tokyo, Japan”. Western Pacific Surveillance and Response 13 (1). https://doi.org/10.5365/wpsar.2022.13.1.906.