1. Division of Epidemiology, Biostatistics, and Environmental Health Sciences, School of Public Health, The University of Memphis, Memphis, TN, USA
2. Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, Southampton, UK
3. Human Development and Health, Faculty of Medicine, University of Southampton, Southampton, UK
4. College of Veterinary Medicine, Michigan State University, East Lansing, MI, USA
5. The David Hide Asthma & Allergy Research Centre, Isle of Wight, UK