1. Institut de Ciència i Tecnologia Ambientals (ICTA), Universitat Autònoma de Barcelona, Barcelona, Spain
2. Geography, School of Environment, Education and Development, University of Manchester, Manchester, UK
3. Institut de Ciència i Tecnologia Ambientals (ICTA), Universitat Autònoma de Barcelona and Epidemiology and Public Health Program, IMIM, Barcelona, Spain
4. Department of Agricultural Economics, Humboldt-Universität zu Berlin, Berlin, Germany