4) Lemmer B, Nold G. Circadian changes in estimated hepatic blood flow in healthy subjects. Br J Clin Pharmacol. 1991; 32(5): 627-9.
5) Ohno M, Yamaguchi I, Ito T, Saiki K, Yamamoto I, Azuma J. Circadian variation of the urinary 6beta-hydroxycortisol to cortisol ratio that would reflect hepatic CYP3A activity. Eur J Clin Pharmacol. 2000; 55(11-12): 861-5.