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→Early twentieth century: Add text and citation.
|DOI=
|accessdate=2021-10-05
}}</ref>
Hiram S. Yellen and Aaron Goldstein invented the [[Gomco]] clamp in 1934-5. The clamp, by crushing the foreskin in an intensely painful procedure, reduced the risk of hemorrhage,<ref name="yellen1935">{{REFjournal
|last=Yellen
|first=Hiram
|init=
|date=1935
|title=Bloodless circumcision of the newborn
|journal=American Journal of Obstetrics and Gynecology
|volume=30
|issue=
|pages=146-7
|url=http://www.historyofcircumcision.net/index.php?option=content&task=view&id=43#yel
|quote=
|accessdate=2021-10-05
}}</ref> but increased the [[pain]].<ref name="sinkey2015">{{REFjournal
|url=https://www.ncbi.nlm.nih.gov/pubmed/25794628?dopt=Abstract
|title=The GoMo study: a randomized clinical trial assessing neonatal pain with Gomco vs Mogen clamp circumcision
|last=Sinkey
|init=RG
|last2=Eschenbacher
|init2=MA
|last3=Walsh
|init3=PM
|last4=Doerger
|init4=RG
|last5=Lambers
|init5=DS
|last6=Sibai
|init6=BM
|last7=Habli
|init7=MA
|journal=Am J Obstet Gynecol
|date=2015-05
|volume=212
|issue=5
|pages=664.e1-8
|DOI=10.1016/j.ajog.2015.03.029
|accessdate=2021-1005
}}</ref>