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. 2022 Mar 17;50(5):1179–1190. doi: 10.1007/s15010-022-01791-1

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Fig. 1 — The geographical distribution of congenital syphilis notification rate in each city of Guangdong Province from 2005 to 2020. Blue color represents Pearl River Delta region, green color represents the North ecological development zone and orange color represents the Eastern and Western wings