The Convoluted Tubules of the Nephron Must Be Considered Elliptical, and Not Circular, in Stereological Studies of the Kidney. - Ortega-Martinez M; Gutierrez-Davila V; Gutierrez-Arenas E; Niderhauser-Garcia A; Cerda-Flores RM; Jaramillo-Rangel G (Kidney & blood pressure research, 2021)