A furanocoumarin-free grapefruit juice establishes furanocoumarins as the mediators of the grapefruit juice-felodipine interaction - Paine, M F; Widmer, W W; Hart, H L; Pusek, S N; Beavers, K L; Criss, A B; Brown, S S; Thomas, B F; Watkins, P B (Am J Clin Nutr, 2006)