Combo photo shows Li Jianing, a nurse from the Second Xiangya Hospital of Central South University, celebrating the closure of a makeshift hospital in Wuhan, central China's Hubei Province, on March 10, 2020 (central figure in left picture) and her portrait photo (right picture) taken on March 17, 2020 in Wuhan. Some medical assistance teams from across China started leaving Hubei Province on Tuesday as the epidemic outbreak in the hard-hit province has been subdued. Before leaving Hubei Province, some medics temporarily took off their facial masks to pose for photos as mementoes. (Xinhua/Shen Bohan)

Combo photo shows Liu Ya, a medical staff from the Second Xiangya Hospital of Central South University, shaking hands with a cured COVID-19 patient discharged from Wuchang temporary hospital in Wuhan, central China's Hubei Province, on March 10, 2020 (left picutre) and his portrait photo (right picture) taken on March 17, 2020 in Wuhan. Some medical assistance teams from across China started leaving Hubei Province on Tuesday as the epidemic outbreak in the hard-hit province has been subdued. Before leaving Hubei Province, some medics temporarily took off their facial masks to pose for photos as mementoes. (Xinhua/Shen Bohan)

Combo photo shows Zhu Ying, a medical staff from the First Hospital of Hunan University of Chinese Medicine, observing the tongue of a COVID-19 patient at Jiangxia temporary hospital in Wuhan, central China's Hubei Province, on Feb. 25, 2020 (left picture) and her portrait photo (right picture) taken on March 17, 2020 before departure at Wuhan Railway Station. Some medical assistance teams from across China started leaving Hubei Province on Tuesday as the epidemic outbreak in the hard-hit province has been subdued. Before leaving Hubei Province, some medics temporarily took off their facial masks to pose for photos as mementoes. (Xinhua/Shen Bohan)

Combo photo shows Dai Feiyue, a medical staff from the First Hospital of Hunan University of Chinese Medicine, observing the image of a COVID-19 patient at Jiangxia temporary hospital in Wuhan, central China's Hubei Province, on Feb. 25, 2020 (left picture) and his portrait photo (right picture) taken on March 17, 2020 before departure at Wuhan Railway Station. Some medical assistance teams from across China started leaving Hubei Province on Tuesday as the epidemic outbreak in the hard-hit province has been subdued. Before leaving Hubei Province, some medics temporarily took off their facial masks to pose for photos as mementoes. (Xinhua/Shen Bohan)

Combo photo shows Tai Shi, a medical staff from the Second Xiangya Hospital of Central South University, giving a thumbs up sign to a cured COVID-19 patient at Wuchang temporary hospital in Wuhan, capital of central China's Hubei Province, March 10, 2020 (left picture) and his portrait photo (right picture) taken on March 17, 2020 in Wuhan. Some medical assistance teams from across China started leaving Hubei Province on Tuesday as the epidemic outbreak in the hard-hit province has been subdued. Before leaving Hubei Province, some medics temporarily took off their facial masks to pose for photos as mementoes. (Xinhua/Shen Bohan)

Combo photo shows Tu Li, a nurse from the First Hospital of Hunan University of Chinese Medicine, conducting treatment to a COVID-19 patient at Jiangxia temporary hospital in Wuhan, central China's Hubei Province on Feb. 25, 2020 (left picture) and her portrait photo (right picture) taken on March 17, 2020 before departure at Wuhan Railway Station. Some medical assistance teams from across China started leaving Hubei Province on Tuesday as the epidemic outbreak in the hard-hit province has been subdued. Before leaving Hubei Province, some medics temporarily took off their facial masks to pose for photos as mementoes. (Xinhua/Shen Bohan)