1. Department of Medicine; Johns Hopkins School of Medicine; Baltimore Maryland U.S.A
2. Association of Chronic Pain Patients; Houston Texas U.S.A
3. Department of Pharmacology; Temple University School of Medicine; Philadelphia Pennsylvania U.S.A
4. Department of Anesthesiology and Pain Medicine; New York University School of Medicine; New York City New York U.S.A
5. Raffles Pain Management Centre; Raffles Hospital; Singapore City Singapore