Contemporary blood lead levels of children aged 0–84 months in China: A national cross-sectional study oleh Min-Ming Li, Zhen-Yan Gao, Chen-Yin Dong, Mei-Qin Wu, Jin Yan, Jia Cao, Wen-Juan Ma, Ju Wang, Ying-Liang Gong, Jian Xu, Shi-Zhong Cai, Jing-Yuan Chen, Shun-Qing Xu, Shilu Tong, Deliang Tang, Jun Zhang, Chong-Huai Yan