1. Department of Pediatrics, Dongsan Medical Center, Keimyung University School of Medicine, Daegu, Korea.
2. Department of Otolaryngology, Dongsan Medical Center, Keimyung University School of Medicine, Daegu, Korea.
3. Department of Psychiatry, Dongsan Medical Center, Keimyung University School of Medicine, Daegu, Korea.
4. Department of Diagnostic Radiology, Daegu Catholic University School of Medicine, Daegu, Korea.
5. Department of Preventive Medicine, Kyungpook National University School of Medicine, Daegu, Korea.