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[[Morten Frisch]] and Jacob Simonsen (2021) carried out a large scale empirical population study in [[Denmark]] of 855,654 males regarding the alleged value of male circumcision in preventing [[HIV]] and other sexually transmitted infections in men. They found that circumcised men have a higher rate of STI and [[HIV]] infection overall than [[intact]] men.<ref name="frisch2021">{{REFjournal |last=Frisch |first=Morten |init= |author-link=Morten Frisch |last2=Simonsen |first2=Jacob |init2= |author2-link= |etal=no |title=Non-therapeutic male circumcision in infancy or childhood and risk of human immunodeficiency virus and other sexually transmitted infections: national cohort study in Denmark |trans-title= |language= |journal=Eur J Epidemiol |location= |date=FrischM SimonsenJ 2021-09-26 |volume=Published online ahead of print |issue= |article= |page= |pages= |url=https://link.springer.com/article/10.1007/s10654-021-00809-6 |archived= |quote= |pubmedID=34564796 |pubmedCID= |DOI=10.1007/s10654-021-00809-6 |accessdate=2021-10-20}}</ref>