[1] Univ Sains Malaysia, Sch Med Sci, Dept Obstet & Gynaecol, Kelantan 16150, Kubang Kerian, Malaysia
[2] Univ Sains Malaysia, Sch Med Sci, Dept Chem Pathol, Kelantan 16150, Kubang Kerian, Malaysia
[3] Univ Sains Malaysia, Sch Med Sci, Womens Hlth Dev Unit, Kelantan 16150, Kubang Kerian, Malaysia
[4] Univ Sains Malaysia, Sch Med Sci, Dept Pathol, Kelantan 16150, Kubang Kerian, Malaysia
[5] Univ Sains Malaysia, Sch Med Sci, Dept Physiol, Kelantan 16150, Kubang Kerian, Malaysia
[6] Univ Sains Malaysia, Sch Med Sci, Biostat & Res Methodol Unit, Kelantan 16150, Kubang Kerian, Malaysia
[7] Univ Kebangsaan Malaysia, Med Ctr, Dept Obstet & Gynaecol, Kuala Lumpur 56000, Malaysia