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→Early twentieth century: Typo
}}</ref> In those long ago days, the true causes of cancer were unknown so it was impossible to disprove Wolbarst's falsehoods.
Laumann et al., writing in 1997, reported an incidence of circumcision of 31 percent in 19321933.<ref name="laumann1931">{{REFjournal
|last=Laumann
|first=Edward O.