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→Anatomy and development of the male genital organ
''Tightness: Foreskin tightness hampering retraction''</blockquote>
Thorvaldsen & Meyhoff (2005) conducted a survey of 4000 young men in [[Denmark]]. They report that the mean age of first foreskin retraction is 10.4 years in [[Denmark]].<ref name="ThorvaldsenThorvaldsen2005">{{REFjournal
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