1. Department of Public Health, Addis Ababa University, 9086 Addis Ababa, Ethiopia
2. Division of Nuclear Physics, Faculty of Engineering, Lund University, 223 63 Lund, Sweden
3. Division of Ergonomics and Aerosol Technology, Department of Design Sciences, Lund University, 223 62 Lund, Sweden;
4. Department of Environmental Health Sciences, Fielding School of Public Health, University of California Los Angeles, California 90095, USA
5. Division of Occupational and Environmental Medicine, Lund University, 221 00 Lund, Sweden;
6. Centre for Environmental and Climate Science, Lund University, 221 00 Lund, Sweden
7. Division of Occupational and Environmental Medicine, Lund University, 221 00 Lund, Sweden
8. International Center for Local Democracy, 621 22 Visby, Sweden