1. Norwegian Knowledge Centre for the Health Services; Postboks 7004 St. Olavs plass Oslo Norway N-0130
2. Norwegian Knowledge Centre for the Health Services; Prevention, Health Promotion and Organisation Unit; PO Box 7004 St Olavs Plass Oslo Norway 0130
3. Aker University Hospital; Division of Substance Addiction; Sognsvannsveien 21 Oslo Norway N-0320