1. Aarhus University; Centre for Alcohol and Drug Research; Købmagergade 26 E København C Denmark 1150
2. Ghent University; Department of Orthopedagogics; Dunantlaan 2 Gent Belgium B-9000
3. Wright State University; Community Health; Medical Sciences Bldg 215, Main Campus Dayton Ohio USA
4. Lund University; Department of Psychology; Box 213 Lund Sweden 22100