Akbas, Sedat, and Ahmet Selim Ozkan. “Regional Versus General Anesthesia in Patients Underwent Hip Fracture Surgery over 80 Years Old: A Retrospective Cohort Study”. Annals of Medical Research 25, no. 4 (May 25, 2021): 0698–0703. Accessed July 22, 2024. http://annalsmedres.org/index.php/aomr/article/view/1100.