[1] Univ Turku, Econ Dept, Turku 20014, Finland
[2] Finnish Inst Hlth & Welf, Dept Publ Hlth Solut, Alcohol Drugs & Addict Unit, Mannerheimintie 166, Helsinki 00271, Finland
[3] Univ Eastern Finland, Fac Hlth Sci, Yliopistokatu 2, Joensuu 80100, Finland