1. Department of Environmental and Occupational Health, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
2. Department of Environmental Engineering, Universiti Tunku Abdul Rahman, Faculty of Engineering and Green Technology, Kampar, Perak, Malaysia
3. Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, Selangor, Malaysia