Kupczyk, Katarzyna, Mikhail Kazachok, Szymon Paruszewski, Aleksandra Dybcio, Mikołaj Jońca, Natasza Kurys, Dorota Szydłowska, Adam Kubisa, Mateusz Miluski, and Julia Kupczak. “Klinefelter Syndrome – Etiology, Clinical Presentation and Modern Approaches to the Diagnosis and Treatment: A Literature Review”. Journal of Education, Health and Sport 90 (April 10, 2026). Accessed April 11, 2026. https://apcz.umk.pl/JEHS/article/view/70248.