The L-shaped association between body roundness index and all-cause mortality in osteoporotic patients: a cohort study based on NHANES data - Ding, Ziyao; Li, Wenbo; Qi, Haixu; Fang, Tianci; Zhu, Qirui; Qu, Xinzhe; Chen, Changchang; Sun, Jun; Pang, Yong (Frontiers in Nutrition, 2025)