1. Institute for Housing and Urban Research, Uppsala University, SE-75120 Uppsala, Sweden;
2. Centre for Research on Environment, Society and Health, Institute of Health and Wellbeing, University of Glasgow, Glasgow G20 0TY, United Kingdom;
3. Alterra/Cultural Geography, Wageningen University and Research Center, 6700 AA Wageningen, The Netherlands;
4. School of Public Health, University of Washington, Seattle, Washington 98195, USA;