Efficient Isolation and Long-term Red Fluorescent Nanodia-mond Labeling of Umbilical Cord Mesenchymal Stem Cells for the Effective Differentiation into Hepatocyte-like Cells oleh Trung Kien Do, Van Hanh Nguyen, Thanh Nga Nguyen, Viet Linh Nguyen, Dinh Minh Pham, Trung Nam Nguyen, Thi Thanh Huyen Tran, Thi Thu Huong Ngo, Hoang Ha Chu