[1] Belgian Red Cross Flanders, Ctr Evidence Based Practice, Mechelen, Belgium
[2] Katholieke Univ Leuven, Fac Med, Dept Publ Hlth & Primary Care, Leuven, Belgium
[3] Katholieke Univ Leuven, Fac Social Sci, Leuven, Belgium
[4] Univ South Australia, Ctr Populat Hlth Res, Adelaide, Australia
[5] EAWAG, Environm Social Sci, Dubendorf, Switzerland
[6] Stellenbosch Univ, Div Community Hlth, Fac Med & Hlth Sci, Cape Town, South Africa
[7] Univ Ghent, Fac Med & Hlth Sci, Ghent, Belgium
[8] Stellenbosch Univ, Ctr Evidence Based Hlth Care, Fac Med & Hlth Sci, Cape Town, South Africa