Eskola, S., Lauhikari, M., Voipio, H.-M., Laitinen, M. and Nevalainen, T. 1999. Environmental enrichment may alter the number of rats needed to achieve statistical significance. Scandinavian Journal of Laboratory Animal Science. 26, 3 (Dec. 1999). DOI:https://doi.org/10.23675/sjlas.v26i3.845.