Brazilian Green Propolis Extract Synergizes with Protoporphyrin IX-mediated Photodynamic Therapy via Enhancement of Intracellular Accumulation of Protoporphyrin IX and Attenuation... oleh Cheng-Cheng Wang, Yu-Xuan Wang, Nian-Qin Yu, Die Hu, Xiao-Yan Wang, Xing-Guang Chen, You-Wei Liao, Jing Yao, Hao Wang, Ling He, Liang Wu