1. Department of Health Services Research and Policy, London School of Hygiene & Tropical Medicine, London, UK
2. Institute of Geography and the Lived Environment, University of Edinburgh, Edinburgh, UK
3. Centre for Population Health Research, Curtin University, Perth, Australia
4. CHESS Karolinska Institutet, Stockholm University, Stockholm, Sweden
5. Institute for Clinical Evaluative Sciences, Toronto, Canada
6. Center of Data and Knowledge Integration for Health (CIDACS), Instituto Gonçalo Moniz, Fundação Oswaldo Cruz, CEP 41745-715 Salvador-Bahia, Brazil
7. Graduate School of Education, University of Bristol, Bristol, UK, and UCL Great Ormond Street Institute of Child Health, London, UK