1. Department of Otorhinolaryngology Head & Neck Surgery Hospital Tawau Sabah Malaysia
2. Department of Otorhinolaryngology Head and Neck Surgery Airlangga University School of Medicine/Dr Soetomo General Hospital Surabaya Indonesia
3. Department of Otorhinolaryngology Head & Neck Surgery School of Medical Sciences, Universiti Sains Malaysia Health Campus 16150 Kubang Kerian Kelantan Malaysia