MMP-2 associated imbalance of VEGF/Endostatin is linked to suppression of the PI3K/AKT/HIF-1α pathway in steroid-induced osteonecrosis of femoral head - Guangyang Zhang; Zhaopu Jing; Jialin Liang; Leifeng Lv; Xiaoqian Dang; Qichun Song (PLoS ONE, 2026)