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Gana TJ, Pascual ML, Fleming RR, Schein JR, Janagap CC, Xiang J, Vorsanger GJ; 023 Study Group.Gana TJ, et al. Among authors: xiang j.Curr Med Res Opin. 2006 Jul;22(7):1391-401. doi: 10.1185/030079906X115595.Curr Med Res Opin. 2006.PMID: 16834838Clinical Trial.