Low-level and combined exposure to environmental metal elements affects male reproductive outcomes: Prospective MARHCS study in population of college students in Chongqing, China

Zili Chai, Guanghui Zhang, Xi Ling, Tingting Dong, Jingrong Wang, Yanqi Zhang, Peng Zou, Huan Yang, Niya Zhou, Qing Chen, Yuxin Zheng, Jinyi Liu, Jia Cao, Lin Ao