1. MFPH, MSc, MBCHB, Specialist Registrar in Public Health, Centre for Radiation, Chemicals and Environmental Hazards, Health Protection Agency, 7th Floor Holborn Gate, 330 High Holborn, London, WC1V 7PP, UK,
2. MD, PhD, Faculty of Medicine, Addis Ababa University, Addis Ababa, Ethiopia
3. FFOM, FRCP, FRCPath, FFPH, Centre for Radiation, Chemicals and Environmental Hazards, Health Protection Agency, London, UK