1. Department of Otorhinolaryngology, Head and Neck Surgery, Pantai Hospital Laguna Merbok, Bandar Laguna Merbok, Sungai Petani, Kedah, Malaysia
2. Department of Otorhinolaryngology-Head and Neck Surgery, School of Medical Sciences, Universiti Sains Malaysia, Kota Bharu, Malaysia
3. International Medical University (IMU) Centre for Education, International Medical University, Bukit Jalil, Kuala Lumpur, Malaysia