Pretreatment with Lithospermic Acid Attenuates Oxidative Stress- induced Apoptosis in Bone Marrow-derived Mesenchymal Stem Cells via Anti-oxidation and Activation of PI3K/Akt Pathw... oleh Li Wang-Yang, Zhou You-Liang, Li Tiao, Zeng Peng, Xu Wu-Ji, Lu Xiao-Long, Qi Xin-Yu, Xiong Hui