Effect of different levels of physical activity upon anatomical and histologic changes related to renal aging oleh Benjamin Wancjer, MD, Ximena Rincón, MV, Íngrid Romero, MV, Germán Santamaría, HTL, Ernesto Dalmau, MV, MSC, Rafael Andrade, MD, Claudio Bohórquez, MV, MSC, Andrés Díaz, MD, Jesús Muñoz, MD