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Leusch, F. D., Van den Heuvel, M. R., Chapman, H. F., Gooneratne, S. R., Eriksson, A. M., & Tremblay, L. A. (2006). Development of methods for extraction and in vitro quantification of estrogenic and androgenic activity of wastewater samples. Comparative Biochemistry And Physiology.toxicology & Pharmacology: Cbp, 143(1), 117-126. doi:10.1016/j.cbpc.2005.12.010