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}}</ref> Øster (1968) reported that some boys will not develop retractable foreskin until after puberty.<ref name="Øster1968">{{REFjournal |last=Øster |first=Jakob |init=J |title=Further fate of the foreskin: incidence of preputial adhesions, phimosis, and smegma among Danish schoolboys |journal=Arch Dis Child |date=OesterJ 1968-04-01 |volume=43 |issue= |pages=200-3 |url=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2019851/pdf/archdisch01557-0066.pdf |quote= |pubmedID=5689532 |pubmedCID=2019851 |DOI=10.1136/adc.43.228.200 |accessdate=2021-07-18}}</ref>