Association between METS-IR and female infertility: a cross-sectional study of NHANES 2013–2018 - Li, Haiyan; Tan, Hongxia; OuYang, Zhenbo; Hu, Xianyue; Bao, Yanjing; Gao, Tianyang; Hua, Wenfeng (Frontiers in Nutrition, 2025)