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}}</refname="green2010"> Both the U.S. and sub-Saharan Africa have relatively high incidence rates of [[HIV]] infection, considering that about 75% of U.S. men and about 70% of sub-Saharan African men are circumcised—higher percentages than in most other regions or countries with lower prevalence of [[HIV]].<ref name="Green etal 2010">{{REFjournal