Fig. 1
From: Comparing spatial patterns of 11 common cancers in Mainland China
Number of studies investigating (a) the spatial patterns and (b) the environmental and human behavioral risk factors for cancers worldwide and in China from 1991 to 2021, according to Web of Science and PubMed. Key words used are ‘cancer or tumor or neoplasm’ and ‘spatial cluster* or spatial analysis or spatial pattern*’. An asterisk indicates that all terms that begin with a word followed by an asterisk will be searched. The total number of papers is 631, and only those with quantitative analyses are included