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Paul IM, Shaffer ML, Yoder KE, Sturgis SA, Baker MS, Berlin CM Jr.Paul IM, et al. Among authors: shaffer ml.Clin Ther. 2004 Sep;26(9):1508-14. doi: 10.1016/s0149-2918(04)80297-2.Clin Ther. 2004.PMID: 15531013Clinical Trial.