A recovered patient with severe novel coronavirus pneumonia (NCP) shows his thank letter to medical staff at the west campus of Wuhan Union Hospital in Wuhan, central China's Hubei Province, Feb. 19, 2020. A total of 31 patients infected with severe NCP recovered and were discharged on Wednesday from the west campus of Wuhan Union Hospital, after receiving medical treatment of nearly two weeks. (Xinhua/Chen Yehua)