1. Department of Basic Medical Science, Division of Microbiology, Faculty of Medicine, Universitas Padjadjaran, Bandung, Indonesia
2. Department of Otorhinolaryngology-Head and Neck, Santosa Hospital Bandung Central, Bandung, Indonesia
3. Faculty of Medicine, Universitas Padjadjaran, Bandung, Indonesia
4. Department of Otolaryngology-Head and Neck, Faculty of Medicine, Universitas Padjadjaran/Hasan Sadikin General Hospital, Bandung, Indonesia
5. Department of Basic Medical Science, Division of Physiology, Faculty of Medicine, Universitas Padjadjaran, Bandung, Indonesia