1. Department of Otorhinolaryngology‐Head and Neck Surgery Universiti Kebangsaan Malaysia Kuala Lumpur Malaysia
2. Unit of Biostatistics and Research Methodology, School of Medical Sciences Universiti Sains Malaysia Kubang Kerian Kelantan Malaysia
3. Department of Otolaryngology, Yong Loo Lin School of Medicine National University of Singapore Singapore Singapore
4. Department of Otorhinolaryngology‐Head and Neck Surgery, School of Medical Sciences Universiti Sains Malaysia Kubang Kerian Kelantan Malaysia