Blood cadmium levels of children aged 0–6 years in China: A national cross-sectional study - Xinxin Zhang; Yin Lin; Yuqing Wang; Junxia Liu; Xinyi Cui; Yong Chen; Yan Wu; Fengxiu Ouyang; Xianting Jiao; Kang Cai; Chonghuai Yan (Science of The Total Environment, 2025)