1. Scottish Centre for Indoor Air, Population Health Sciences, University of Aberdeen, Aberdeen, United Kingdom
2. Scottish Centre for Indoor Air, Institute of Occupational Medicine, Edinburgh, United Kingdom
3. Centre for International Health and Development, University College London, London, United Kingdom
4. Malawi-Liverpool-Wellcome Clinical Research Laboratories, Universities of Malawi and Liverpool (United Kingdom), Blantyre, Malawi
5. Environmental Health Sciences Research Center, University of Iowa, Iowa City, Iowa, USA
6. Mother and Infant Research Activities, Department of Paediatrics, Kathmandu Medical College, Kathmandu, Nepal
7. Institute of Occupational and Environmental Medicine, University of Birmingham, Birmingham, United Kingdom