Case in North China: Fengtai District Maternal and Child Health Hospital of Beijing

Case in North China: Siziwang Banner Central Elderly Care Home, Ulanqab City, Inner Mongolia

Case in North China: Gaoyang County People's Hospital, Baoding City, Hebei Province

Case in North China: Yanqing Hospital of Beijing Hospital of Traditional Chinese Medicine, Yanqing, Beijing

Case in North China: Beijing Ditan Hospital, Beijing, China

Case in North China: Special Medical Center of Tianjin Armed Police Hospital, Tianjin

Case in North China: Beijing Southern Suburb Cancer Hospital, Beijing

Case in North China: Tianjin Blood Disease Hospital, Tianjin

Case in North China: Tianjin Medical University General Hospital, Tianjin, China

Case in North China: Beijing Hospital of Integrated Traditional Chinese and Western Medicine, Beijing

Case in North China: Shoujia Elderly Care Service Center, Tangshan, Hebei

Case in North China: New Campus of Taiyuan Maternal and Child Health Hospital (Changfeng Campus), Taiyuan, Shanxi

Case in North China: Beijing Friendship Hospital ICU, Beijing

Case in North China: Peking University Cancer Hospital Operating Room, Beijing

Case in North China: New Campus of Linfen People’s Hospital, Linfen, Shanxi

Case in North China: Xinzhou People’s Hospital, Xinzhou, Shanxi