Human umbilical cord‐derived mesenchymal stem cells conditioned medium attenuate interstitial fibrosis and stimulate the repair of tubular epithelial cells in an irreversible model of unilateral ureteral obstruction. - Xiong, Geng; Lin, Tao; He, Da‐Wei; Wei, Guang‐Hui; Liu, Bo; Liu, Yang; Zhang, De‐Ying; Ding, Feng‐Xia; Zhang, Yuan‐Yuan (Nephrology, 2018)