1. Department of Otorhinolaryngology, Hospital Sultan Ismail, Johor Bahru, Malaysia
2. Hospital Sultanah Aminah, Jalan Persiaran Abu Bakar Sultan, Johor Bahru, Malaysia
3. Department of Otorhinolaryngology, Hospital Raja Permaisuri Bainun, Jalan Raja Ashman Shah, Ipoh, Malaysia
4. Department of Psychiatry, Hospital Kuala Lumpur, Kuala Lumpur, Malaysia