Mermer, Damla, Guldem Turan, Ceren Koksal, Berna Ayanoglu Tas, Firdevs Karadogan, and Nur Akgun. 2016. “Correlation of Integrated Pulmonary Index With Clinical Observation in Unilateral and Bilateral Spinal Anaesthesia in Geriatric Patients”. International Journal of Research in Medical Sciences 4 (10):4438-43. https://doi.org/10.18203/2320-6012.ijrms20163307.