1. Department of Otorhinolaryngology, Jigme Dorji Wangchuck National Referral Hospital, Thimphu, Bhutan
2. Faculty of Postgraduate Medicine, Khesar Gyalpo University of Medical Sciences of Bhutan, Thimphu, Bhutan
3. Department of Otorhinolaryngology, University of Malaya, Kuala Lumpur, Malaysia