Kansiz , Tolga, Hilal Ayoglu, Bengu Gulhan Aydin, Rahsan Dilek Okyay, Gamze Kucukosman, Huseyin Oztoprak, and Ozcan Piskin. 2022. “The Efficacy of Inferior Vena Cava Diameter, Perfusion Index and Pleth Variability Index on Predicting Hypotension in Spinal Anesthesia”. Annals of Medical Research 29 (6):616-22. http://www.annalsmedres.org/index.php/aomr/article/view/4192.