1. Global and Public Health, Weill Cornell Medical College in Qatar, P.O. Box 24144, Doha, Qatar
2. Preventive Medicine, Department of Population Health, North Shore University Hospital, 175 Community Drive, 2nd Fl. Great Neck, NY 11021, USA
3. Occupational Health and Safety Unit, Ethekwini Municipality, P.O. Box 5892, Durban 4000, South Africa