U-shaped association between outdoor artificial light at night exposure and metabolic syndrome in Chinese youth: Findings from a nationally representative study - Wen-xin Ge; Zhao-huan Gui; Zhi-Yong Zou; Li-qing Yao; Wen-wen Bao; Le-bing Wang; Li-xin Hu; Zheng-ge Jin; Wan-xin Wu; Jun Ma; Ying-Hua Ma; Ya-jun Chen (Environmental Pollution, 2026)