Endothelial progenitor cells in cardiovascular diseases: from biomarker to therapeutic agentHui-Bin Liu, Yuan-Feng Gong, Chang-Jiang Yu, Ying-Ying Sun, Xin-Yuan Li, Dan Zhao and Zhi-Ren ZhangRegen Med Res, 1 (2013) 9DOI: https://doi.org/10.1186/2050-490X-1-9