1. NEMA Research; Naples; Florida; U.S.A
2. Alexander Sinclair MD Inc; Beverly Hills; California; U.S.A
3. Department of Pharmaceutical Sciences; Temple University School of Pharmacy; Philadelphia; Pennsylvania; U.S.A
4. Pain Relief Unit; Churchill Hospital; Oxford; U.K
5. Ambulatory Anesthesia of Atlanta; Atlanta; Georgia; U.S.A
6. 1Perioperative Clinical Research Core, Department of Anesthesia and Perioperative Care; University of California at San Francisco; San Francisco; California; U.S.A