[1] Univ Leuven, Ctr Environm & Hlth, Dept Publ Hlth & Primary Care, Leuven, Belgium
[2] Univ Ghent, Fac Med & Hlth Sci, Dept Publ Hlth & Primary Care, B-9000 Ghent, Belgium
[3] Univ Antwerp, Fac Med & Hlth Sci, Dept Family Med & Populat Hlth, Antwerp, Belgium
[4] Hasselt Univ, Fac Med & Life Sci, Diepenbeek, Belgium
[5] Vrije Univ Brussel, Fac Med & Pharm, Dept Clin Sci, Brussels, Belgium
[6] Flemish Ctr Expertise Alcohol & Other Drugs, VAD, Brussels, Belgium
[7] IDEWE, External Serv Prevent & Protect Work, Leuven, Belgium
[8] Univ Antwerp, Fac Med, Antwerp, Belgium
[9] Katholieke Univ Leuven, Fac Med, Leuven, Belgium
[10] Vrije Univ Brussel, Fac Med & Pharm, Dept Family Med & Chron Care, Brussels, Belgium