1. Department of Physiology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand;
2. Department of Pathology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand;
3. Department of Otolaryngology, Head and Neck Surgery, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand;
4. Department of Otolaryngology, Head and Neck Surgery, King Chulalongkorn Memorial Hospital, Thai Red Cross Society, Bangkok, Thailand