1. Pain Clinic Office; Gartnavel General Hospital; University of Glasgow; UK
2. MAC Clinical Research; Trafford Park; Manchester UK
3. Neurology Department; Na Fratisku Hospital; Prague Czech Republic
4. West Suffolk Hospital; Bury St Edmunds UK
5. GW Pharma Ltd; Porton Down Science Park; Salisbury UK
6. Neurologické odd; Krajská nemocnice Pardubice; Pardubice Czech Republic