1. Department of Immunology, School of Medical Sciences, Universiti Sains Malaysia, 16150, Kubang Kerian, Kelantan, Malaysia
2. Department of Medical Microbiology & Parasitology, School of Medical Sciences, Universiti Sains Malaysia, 16150, Kubang Kerian, Kelantan, Malaysia
3. Department of Haematology, School of Medical Sciences, Universiti Sains Malaysia, 16150, Kubang Kerian, Kelantan, Malaysia
4. Department of Biology, Omdurman Islamic University, 14415, Omdurman, Sudan
5. Department of Internal Medicine, School of Medical Sciences, Universiti Sains Malaysia, 16150, Kubang Kerian, Kelantan, Malaysia
6. GI Function & Motility Unit, Hospital Universiti Sains Malaysia, Universiti Sains Malaysia, 16150, Kubang Kerian, Kelantan, Malaysia