When there are more than ten authors, list the first ten followed by "et al."
Park KS, Kim YS, Kim JH, Choi BK, Kim SH, Oh SH, Ahn YR, Lee MS, Lee MK, Park JB, et al. 2009. Influence of human allogenic bone marrow and cord blood-derived mesenchymal stem cell secreting trophic factors on ATP (adenosine-5 '-triphosphate)/ADP (adenosine- 5'-diphosphate) ratio and insulin secretory function of isolated human islets from cadaveric donor. Transplant Proc. 41(9): 3813-3818.