Assessment of the sources and health risks of heavy metals in the soil-rice system based on positive matrix factorization and Monte Carlo simulation - Tong, Lei; Yang, Aoran; Fan, Mingyue; Wang, Dan; Liu, Yi; Huang, Xiangqiang; Xiang, Lian; Fu, Rongsheng; Cheng, Longfeng (Frontiers in Environmental Science, 2025)