1. Peter O'Donnell Jr School of Public Health University of Texas Southwestern Medical Center Dallas Texas USA
2. Division of Epidemiology, Biostatistics and Environmental Health, School of Public Health University of Memphis Memphis Tennessee USA
3. Clinical and Experimental Sciences, Faculty of Medicine University of Southampton Southampton UK
4. David Hide Asthma and Allergy Research Centre, Isle of Wight Newport UK
5. NIHR Southampton Biomedical Research Center University Hospital Southampton Southampton UK
6. College of Veterinary Medicine Michigan State University East Lansing Michigan USA
7. MRC Integrative Epidemiology Unit University of Bristol Bristol UK
8. Population Health Sciences, Bristol Medical School University of Bristol Bristol UK
9. National Institute for Health Research Bristol Biomedical Research Centre, University of Bristol and University Hospitals Bristol NHS Foundation Trust Bristol UK
10. Human Development and Health, Faculty of Medicine University of Southampton Southampton UK