1. Department of Othorhinolaryngology, Universiti Teknologi MARA, Sungai Buloh, Malaysia
2. Department of Othorhinolaryngology, Universiti Kebangsaan Malaysia Medical Centre (UKMMC), Cheras, Malaysia
3. Department of Medicine, Universiti Kebangsaan Malaysia Medical Centre (UKMMC), Cheras, Malaysia
4. Department of Primary Care, Universiti Teknologi MARA, Sungai Buloh, Malaysia
5. Department of Community Health, Universiti Kebangsaan Malaysia Medical Centre (UKMMC), Cheras, Malaysia