Fig. 1From: Spatial-temporal distribution of human brucellosis in mainland China from 2004 to 2017 and an analysis of social and environmental factorsGeographical map of mainland China. Provinces were characterized as southern and northern regions according to the Qinling-Huaihe boundary. Areas south of the Qinling-Huaihe boundary are considered southern China, and areas north of the boundary are considered northern ChinaBack to article page