A. H. AL-Hillawi, H. A. AL-Dhahir, and J. M. Ghadban, “Assessment of parasympathetic autonomic functions in ulcerative colitis patients”, JFacMedBagdad, vol. 55, no. 3, pp. 265–269, Jul. 2013, doi: 10.32007/jfacmedbagdad.553628.