1. Department of Community Health, Faculty of Medicine & Health Sciences, Universiti Putra Malaysia, Serdang, Selangor, Malaysia;
2. Road Safety Research Centre, Faculty of Engineering, Universiti Putra Malaysia, Serdang, Selangor, Malaysia;
3. Department of Environmental and Occupational Health, Faculty of Medicine & Health Sciences, Universiti Putra Malaysia, Serdang, Selangor, Malaysia