New Estimation of Antibiotic Resistance Genes in Sediment Along the Haihe River and Bohai Bay in China: A Comparison Between Single and Successive DNA Extraction Methods oleh Chao Wu, Chao Wu, Guicheng Zhang, Guicheng Zhang, Wenzhe Xu, Wenzhe Xu, Shan Jian, Shan Jian, Liyin Peng, Liyin Peng, Dai Jia, Dai Jia, Jun Sun, Jun Sun