TY - RPRT TI - Age-Group Differences in Skeletal Age, Anabolic Hormones, and Physical Fitness in Elite Youth Football Players from Under-13 to Under-16 AU - Eskandarifard, E. AU - Kargarfard, M. AU - Oliveira, R. AU - Afsanepurak, S. AU - Nobari, H. AU - Figueiredo, A. PY - 2026 DO - 10.64898/2026.06.11.731548 UR - https://www.biorxiv.org/content/10.64898/2026.06.11.731548v1 ID - 10.64898/2026.06.11.731548 ER -