Mayer L, Pandak WM, Melmed GY, Hanauer SB, Johnson K, Payne D, Faleck H, Hariri RJ, Fischkoff SA.  2013.  Safety and tolerability of human placenta-derived cells (PDA001) in treatment-resistant crohn's disease: a phase 1 study.. Inflamm Bowel Dis. 19(4):754-60.