[1] Univ Sains Malaysia, Sch Med Sci, Dept Immunol, Kubang Kerian 16150, Kelantan, Malaysia
[2] Univ Sains Malaysia, Sch Med Sci, Dept Med Microbiol & Parasitol, Kubang Kerian 16150, Kelantan, Malaysia
[3] Univ Sains Malaysia, Sch Med Sci, Dept Haematol, Kubang Kerian 16150, Kelantan, Malaysia
[4] Omdurman Islamic Univ, Dept Biol, Omdurman 14415, Sudan
[5] Univ Sains Malaysia, Sch Med Sci, Dept Internal Med, Kubang Kerian 16150, Kelantan, Malaysia
[6] Univ Sains Malaysia, Hosp Univ Sains Malaysia, GI Funct & Motil Unit, Kubang Kerian 16150, Kelantan, Malaysia