Choi, J. R. ., B. . Pingguan-Murphy, W. A. B. W. . Abas, M. A. N. . Azmi, S. Z. . Omar, K. H. . Chua, and W. K. Z. W. . Safwani. “Hypoxia Promotes Growth and Viability of Human Adipose-Derived Stem Cells With Increased Growth Factors Secretion”. Journal of Asian Scientific Research, vol. 4, no. 7, July 2014, pp. 328-3, https://archive.aessweb.com/index.php/5003/article/view/3646.