[1] Int Med Univ, Dept Otorhinolaryngol, Clin Campus Jalan Rasah, Seremban 70300, Negeri Sembilan, Malaysia
[2] Univ Sains Malaysia, Dept Otorhinolaryngol Head & Neck Surg, Sch Med Sci, Hlth Campus, Kota Baharu 16150, Kelantan, Malaysia
[3] Int Med Univ, Dept Pathol, 126 Jalan Jalil Perkasa 19, Kuala Lumpur, Malaysia
[4] Hosp Tawau, Dept Otorhinolaryngol Head & Neck Surg, Tawau 91007, Malaysia