Associations between metabolic syndrome and erectile dysfunction: evidence from the NHANES 2001–2004 - Wang, Wei; Zhao, Shuai; Zhou, Ran; Yu, Pei-Ze; Pan, Si-Yuan; Huan, Peng-Fei; Shi, Zhen-Duo; Liu, Ying; Hu, Xiao; Lu, Jing-Ru; Han, Conghui (Frontiers in Public Health, 2025)