[1] Merck & Co Inc, Dept Pharmacokinet Dynam Metab & Bioanalyt, West Point, PA USA
[2] Univ Toronto, Temerty Fac Med, Dept Pharmacol & Toxicol, Toronto, ON, Canada
[3] Univ Minnesota, Coll Pharm, Dept Expt & Clin Pharmacol, Minneapolis, MN, Dominica
[4] Stanford Univ, Sch Med, Dept Anesthesiol Perioperat & Pain Med, Stanford, CA 94305 USA