Marks caused by masks are seen on the face of a medical worker at Fuzhou Pulmonary Hospital of Fujian in Fuzhou, southeast China's Fujian Province, Jan. 31, 2020. The hospital is a designated hospital for the treatment of pneumonia caused by the novel coronavirus, equipped with two floors of isolation wards as well as 8 doctors and 34 nurses working round the clock. (Photo by Wang Yi/Xinhua)