Risk factors for hypotension in regional spinal anesthesia for cesarean section. Role of the Waist-to-Hip Ratio and Body Mass Index. - López Hernández, María Gabriela; Meléndez Flórez, Héctor Julio; Álvarez Robles, Saúl; de Lugan Alvarado Arteaga, Jorge (Colombian Journal of Anesthesiology / Revista Colombiana de Anestesiología, 2018)