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Cohen DA, Pascual-Leone A, Press DZ, Robertson EM.Cohen DA, et al.Proc Natl Acad Sci U S A. 2005 Dec 13;102(50):18237-41. doi: 10.1073/pnas.0506072102. Epub 2005 Dec 5.Proc Natl Acad Sci U S A. 2005.PMID: 16330773Free PMC article.