1. Department of Community Health, Advanced Medical & Dental Institute, Universiti Sains Malaysia, Pulau Pinang, Malaysia
2. Centre for Epidemiology and Evidence-Based Practice, Department of Social & Preventive Medicine, University of Malaya, Kuala Lumpur, Malaysia
3. Centre for Occupational and Environmental Health-UM, Department of Social & Preventive Medicine, University of Malaya, Kuala Lumpur, Malaysia