Freire Guerra, Francisca, Aida Hualpa Freire, and Patricio Teran Pilatasig. 2018. “Complication of Anesthesia Spinal for Knee Surgery: Cauda Equina Syndrome”. Mediciencias UTA 2 (3):32-36. https://revistas.uta.edu.ec/erevista/index.php/medi/article/view/1347.