1. Department of Otorhinolaryngology-Head and Neck Surgery, Korea University College of Medicine, Ansan Hospital, Ansan 15355, Republic of Korea
2. Department of Biostatistics, Korea University College of Medicine, Seoul 08308, Republic of Korea
3. Biomedical Research Center, Korea University Ansan Hospital, Ansan 15355, Republic of Korea
4. Department of Biomedical Informatics, College of Medicine, Korea University, Seoul 02841, Republic of Korea