Xu Xiaoyan (C), a head nurse from a hospital affiliated to Gansu University of Chinese Medicine, shows how to wear protective devices for the members of a medical team before their departure for Wuhan of Hubei Province, in Lanzhou, northwest China's Gansu Province, Jan. 28, 2020. A medical team comprised of 137 medical workers from Gansu left for Wuhan on Tuesday to aid the novel coronavirus control efforts there. (Xinhua/Chen Bin)