[1] Katholieke Univ Leuven, Dept Publ Hlth & Primary Care, Leuven, Belgium
[2] Univ Gothenburg, Inst Hlth & Care Sci, Gothenburg, Sweden
[3] Univ Cape Town, Dept Paediat & Child Hlth, Cape Town, South Africa
[4] Res Fdn Flanders FWO, Brussels, Belgium
[5] Katholieke Univ Leuven, Sch Psychol & Dev Context, Leuven, Belgium
[6] Univ Free State, UNIBS, Bloemfontein, South Africa
[7] Katholieke Univ Leuven, Dept Publ Hlth & Primary Care, Kapucijnenvoer 35,Box 7001, B-3000 Leuven, Belgium