1. Department of Medicine, Al-Anbar University, Ramadi, Iraq
2. Department of Primary Care and Public Health, Imperial College London, Kensington, London, United Kingdom
3. Department of Primary Care and Public Health, WHO Collaborating Centre for Public Health Education and Training, Imperial College London, Kensington, London, United Kingdom
4. Faculty of Medicine, National Heart and Lung Institute, Imperial College London, Kensington, London, United Kingdom
5. London North West Healthcare NHS Trust, Harrow, London, United Kingdom