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}}</ref> His data have been incorporated into many textbooks and is still being repeated in the medical literature today. [[Douglas Gairdner |Gairdner]] said that 80 percent of boys should have a retractable foreskin by the age of two years, and 90 percent of boys should have a retractable prepuce by the age of three years.<ref name="Gairdner"/>

Unfortunately, Gairdner’s [[Douglas Gairdner|Gairdner]]’s data are inaccurate,<ref name="Wright">{{REFjournal