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    Seideman P, Beck O, Eksborg S, Wennberg M. The pharmacokinetics of methotrexate and its 7-hydroxy metabolite in patients with rheumatoid arthritis. Br J Clin Pharmacol 1993; 35: 40912.
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    Chladek J, Martinkova J, Simkova M, Vaneckova J, Koudelkova V, Nozickova M. Pharmacokinetics of low doses of methotrexate in patients with psoriasis over the early period of treatment. Eur J Clin Pharmacol 1998; 53: 43744.
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    Chladek J, Grim J, Martinkova K, Simkova M, Vaniekova J, Koudelkova V, et al. Pharmacokinetics and pharmacodynamics of low-dose methotrexate in the treatment of psoriasis. Br J Clin Pharmacol 2002; 54: 14756.
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    Rodrigues AD. Comparison of levels of aldehyde oxidase with cytochrome P450 activities in human liver in vitro. Biochem Pharmacol 1994; 48: 197200.
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    Al-Salmy HS. Individual variation in hepatic aldehyde oxidase activity. IUBMB Life 2001; 51: 24953.
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    Baggott JE, Morgan SL, Koopman WJ. The effect of methotrexate and 7-hydroxymethotrexate on rat adjuvant arthritis and on urinary aminoimidazole carboxamide excretion. Arthritis Rheum 1998; 41: 140710.