O.  Koren, Goodrich, J. K., Cullender, T. C., Spor, A., Laitinen, K., Bäckhed, H. Kling, Gonzalez, A., Werner, J. J., Angenent, L. T., Knight, R., and , ?Host Remodeling of the Gut Microbiome and Metabolic Changes During Pregnancy?, vol. 150, pp. 470-480, 2012.