Chun SY, Kwon JB, Chae SY, Lee JK, Bae JS, Kim BS, Kim HT, Yoo ES, Lim JO, Yoo JJ, Kim WJ, Kim BW, Kwon TG. Combined injection of three different lineages of early-differentiating human amniotic fluid-derived cells restores urethral sphincter function in urinary incontinence. BJU Int. 2014 Nov; 114(5):770-83.