Nguyen, P., A. Nguyen, N. Nguyen, N. Nguyen, T. Duong, N. Truong, and N. Phan. “Human Umbilical Cord Blood Derived Mesenchymal Stem Cells Were Differentiated into Pancreatic Endocrine Cell by Pdx-1 Electrotransfer”. Biomedical Research and Therapy, Vol. 1, no. 02, Apr. 2014, pp. 50-56, http://home.biomedpress.org/index.php/BMRAT/article/view/21.