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Xiong L, Yang T, Yang Y, Xu C, Li F. Long-term in vivo biodistribution imaging and toxicity of polyacrylic acid-coated upconversion nanophosphors. Biomaterials. 2010 Sep;31(27):7078–85. doi: 10.1016/j.biomaterials.2010.05.065. PMID: 20619791. |