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Li R, Quan P, Liu DF, Wei FD, Zhang Q, Xu QW.Li R, et al. Among authors: wei fd.AAPS PharmSciTech. 2009;10(4):1137-44. doi: 10.1208/s12249-009-9317-z. Epub 2009 Oct 16.AAPS PharmSciTech. 2009.PMID: 19834815Free PMC article.