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Hedman A, Angelin B, Arvidsson A, Beck O, Dahlqvist R, Nilsson B, Olsson M, Schenck-Gustafsson K.Hedman A, et al.Clin Pharmacol Ther. 1991 Mar;49(3):256-62. doi: 10.1038/clpt.1991.26.Clin Pharmacol Ther. 1991.PMID: 2007320Clinical Trial.