Association of cardiovascular health with COPD (NHANES 2007-2020): mediating potential of lean body mass - Gou, Ruoyu; Chang, Xiaoyu; Dou, Danni; Meng, Xin; Hou, Ling; Zhu, Lingqin; Tuo, Wei; Li, Guanghua (Frontiers in Endocrinology, 2025)