Hoogerwerf, W. ., Shahinian, V. ., Cornélissen, G. ., Halberg, F. ., Bostwick, J. ., Timm, J. ., … Cassone, V. . (2010). Rhythmic changes in colonic motility are regulated by period genes. American Journal of Physiology. Gastrointestinal and Liver Physiology, 298(2), G143-50. https://doi.org/10.1152/ajpgi.00402.2009