Lead and other elements in the diet of children (aged 0–7 years) across 20 Chinese provinces at a home-level survey: seasonal variations of element levels and risks in food, urine, and feces in healthy individuals - Maoyuan He; Xiaoping Li; Yu Gao; Pengyuan Jin; Zebo Yang; Jiayi Li; Xuelian Kui; Tunyang Geng; Xueming Zheng; Xu Zhang; Xiangyang Yan (Environmental Monitoring and Assessment, 2026)