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Ito K, Okano K, Ohgi S, Hara H &amp; Mori T(1987): Venous stasis leg ulcer in klinefelter\u2019s syndrome -a report of two cases - Nihon Rinsho Geka Gakkai Zasshi (The Journal of Japan Surgical Association) 48(6): 872\u2013875 (in Japanese)","DOI":"10.3919\/ringe1963.48.872"},{"key":"31","unstructured":"31. Nakatsuka S, Tanaka H &amp; Namba M (1989): A 48, XXYY male with first cousins for parents: A case report. Nishinihon J Urol 51(5): 1703\u20131707 (in Japanese)"},{"key":"32","doi-asserted-by":"crossref","unstructured":"32. Ikegami M, Hashimoto K, Onishi N, Iguchi M, Kiwamoto H &amp; Kurita T (1994): A case of 48 XXYY Klinefelter\u2019s syndrome. Nihon Hinyokika Gakkai Zasshi 85 (12): 1781\u20131783 (in Japanese)","DOI":"10.5980\/jpnjurol1989.85.1781"},{"key":"33","unstructured":"33. Shibutani Y(1997): A case of 48, XXYY Klinefelter\u2019s syndrome associated with diabetes mellitus. J Japan Diab Soc 40(9): 619\u2013623 (in Japanese)"},{"key":"34","unstructured":"34. 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