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Add Porter 1986 article
|accessdate=2019-12-06
}}</ref></blockquote>
Porter ''et al''. (1986) recorded the pain cries of boys undergoing circumcision. They reported that "Subjective judgments and objective quantitative data converge to demonstrate that infants' cries are perceived as varying and objectively, do systematically vary with respect to the the intensity of the painful stimuli."<ref name="porter1986">{{REFjournal
|last=Porter
|first=Fran Lang
|author-link=
|last2=Miller
|first2=Richard H.
|author2-link=
|last3=Marshall
|first3=Richard E.
|author3-link=
|etal=no
|title=Neonatal pain cries: effect of circumcision on acoustic features and perceived urgency
|trans-title=
|language=
|journal=Child Dev
|location=
|date=1986-06
|volume=57
|issue=
|pages=790-802
|url=http://www.cirp.org/library/pain/porter/
|quote=
|pubmedID=3720404
|pubmedCID=
|DOI=
|accessdate=2019-12-06
}}</ref>
{{REF}}