1. Immunology Unit, Department of Pathology, Faculty of Medicine and Health Sciences; University Putra Malaysia; Selangor Malaysia
2. Department of Medicine, Faculty of Medicine and Health Sciences; University Putra Malaysia; Selangor Malaysia
3. Department of Otolaryngology; Serdang Hospital; Selangor Malaysia
4. Pantai Hospital; Kuala Lumpur Malaysia
5. Otolaryngology Unit, Department of Surgery, Faculty of Medicine and Health Sciences; University Putra Malaysia; Selangor Malaysia