[1] St Louis Univ, Sch Med, Pharmacol & Physiol, St Louis, MO USA
[2] St Louis Univ, Sch Med, Otolaryngol, St Louis, MO USA
[3] NIDDK, Mol Recognit Sect, Bioorgan Chem Lab, NIH, Bethesda, MD 20892 USA
[4] McGill Univ, Fac Dent, Anesthesia, Montreal, PQ, Canada
[5] McGill Univ, Alan Edwards Ctr Res Pain, Montreal, PQ, Canada