1. Faculty of Medicine, Royal College of Medicine Perak, Universiti Kuala Lumpur, Jalan Greentown, 30450 Ipoh, Perak, Malaysia.
2. Faculty of Pharmacy, Royal College of Medicine Perak, Universiti Kuala Lumpur, Jalan Greentown, 30450 Ipoh, Perak, Malaysia.
3. Department of Community Medicine, Quest International University, Ipoh, Perak, Malaysia.