Differential Expression Profile of MicroRNAs during Differentiation of Cardiomyocytes Exposed to Polychlorinated Biphenyls oleh Lin-Mei Qian, Shu-Ping Han, Zheng-Feng Xu, Yu-Fang Qiu, Yu-Lin Chen, Xiao-Shan Hu, Jin-Gai Zhu, Zhang-Bin Yu, Chun Zhu