1. College of Medical and Dental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
2. University Hospital Birmingham NHS Foundation Trust, Queen Elizabeth Hospital Birmingham, Mindelsohn Way, Edgbaston, Birmingham, B15 2WB, UK
3. Institute of Applied Health Research, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
4. Adjunct Professor of Environmental Health, Emory University, Rollins School of Public Health, Atlanta, GA 30322, US
5. Clinical Professor of Surgery, University of Arizona College of Medicine, Phoenix, AZ 85004, US