1. Stavanger University Hospital; Alcohol and Drug Research Western Norway (KoRFor); Postboks 8100 Stavanger Norway 4068
2. Herlev University Hospital; The Cochrane Anaesthesia Review Group, Rigshospitalet & Department of Anaesthesiology; Herlev Ringvej Herlev Denmark 2730
3. Bispebjerg University Hospital; Clinical Health Promotion Centre; Nordre Fasanvej 57 Frederiksberg Denmark 2000
4. Lund University; Department of Health Sciences; Lund Sweden
5. Bispebjerg University Hospital; WHO-CC, Clinical Health Promotion Centre; Bygn.20c,stuen Bispebjerg Bakken 23 Copenhagen NV Denmark 2400