1 Department of Otorhinolaryngology, Hospital Sultanah Bahiyah, Ministry of Health Malaysia, Alor Setar, Kedah, Malaysia. Electronic address: shen-han.lee@cantab.net.
2 Department of Otorhinolaryngology, Hospital Kuala Lumpur, Ministry of Health Malaysia, Kuala Lumpur, Malaysia.
3 Department of Pathology, Hospital Sultanah Bahiyah, Ministry of Health Malaysia, Alor Setar, Kedah, Malaysia.
4 Department of Otorhinolaryngology, Hospital Sultanah Bahiyah, Ministry of Health Malaysia, Alor Setar, Kedah, Malaysia.