Chatu, S., Pilcher, J., Saxena, S., Fry, D., & Pollok, R. (2012). Diagnostic accuracy of small intestine ultrasonography using an oral contrast agent in Crohn’s disease: comparative study from the UK. Clinical Radiology, 67(6), 553-9. https://doi.org/10.1016/j.crad.2011.11.005