Early endocrine and metabolic profiles in prepubertal boys with 47,XXY Klinefelter syndrome: A retrospective cross-sectional study. - Paparella R; Panvino F; Tarani F; Maglione V; Niceta M; Pucarelli I; Spaziani M; Tenuta M; Carlomagno F; Pozza C; Gianfrilli D; Tarani L (Annales d'endocrinologie, 2026)