Subha, Manivannan, Pravati Pal, Gopal Krushna Pal, Syed Habeebullah, Chandrasekaran Adithan, and M G Sridhar. 2014. “Association of Sympathovagal Imbalance With Arterial Stiffness Indices in Women With Risk Factors for Pregnancy‑induced Hypertension in First and Third Trimesters of Gestation”. International Journal of Clinical and Experimental Physiology 1 (2), 113-19. https://ijcep.org/index.php/ijcep/article/view/76.