1. Leibniz-Institute for Prevention Research and Epidemiology – BIPS , Achterstr. 30, 28359 Bremen , Germany
2. Association for Health Promotion and Academy for Social Medicine Lower Saxony Bremen , Fenskenweg 2, 30165 Hannover , Germany
3. Health Sciences Bremen, University of Bremen , Grazer Str. 4, 28359 Bremen , Germany