Abdullah B., Department of Otorhinolaryngology—Head and Neck Surgery, School of Medical Sciences, Universiti Sains Malaysia, Kelantan, Kubang Kerian, 16150, Malaysia; Snidvongs K., Department of Otolaryngology, Faculty of Medicine, Chulalongkorn University, Bangkok, 10330, Thailand; Poerbonegoro N.L., Faculty of Medicine, Universitas Indonesia, Jl. Salemba Raya No. 6, Jakarta, 10430, Indonesia; Sutikno B., Faculty of Medicine, Universitas Airlangga, Jl. Mayjen. Prof. Dr. Moestopo No. 6-8, Surabaya, 60286, Indonesia