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Hoeger, B., Koellner, B., Kotterba, G., Van den Heuvel, M. R., Hitzfeld, B., & Dietrich, D. R. (2004). Influence of chronic exposure to treated sewage effluent on the distribution of white blood cell populations in rainbow trout (Oncorhynchus mykiss) spleen. Toxicological Sciences: An Official Journal Of The Society Of Toxicology, 82(1), 97-105. doi:10.1093/toxsci/kfh250