Fig. 4From: The spatiotemporal distribution of human brucellosis in mainland China from 2007-2016The center of gravity migration track of human brucellosis in China from 2007 to 2016. (The small black dots in the picture show the gravity center of brucellosis between 2007 and 2016. The map data comes from National Geographic Center of China. The website link is http://www.ngcc.cn/ngcc/, Plan approval number is GS (2019)1815)Back to article page