Professor of Anaesthesia, Dept. of Pharmacology, University of Western Australia, Director of Pain Medicine, Royal Perth Hospital, Level
2, MRF Building G Block, Royal Perth Hospital, GPO Box X2213, PERTH WA 6847, Australia, Tel: +61-8-9224 0201, Fax: +61-8-9224 0279, Email: schug@cyllene.uwa.edu.au