[1] Univ Leicester, Leicester, Leics, England
[2] Royalmt Pharma, Montreal, PQ, Canada
[3] NCI, Chemoprevent Agent Dev Res Grp, Bethesda, MD 20892 USA
[4] Univ Michigan, Sch Med, Dept Internal Med, Ann Arbor, MI USA
[5] Univ Michigan, Sch Med, Dept Pharmacol, Ann Arbor, MI 48109 USA
[6] VA Med Ctr, Ann Arbor, MI USA