1. Department of Laboratory Medicine, Dong-A University College of Medicine, Department of Quality Improvement, Busan, Korea
2. Department of Preventive Medicine, Dong-A University College of Medicine, Department of Quality Improvement, Busan, Korea
3. Department of Otorhinolaryngology-Head and Neck Surgery, Dong-A University College of Medicine, Department of Quality Improvement, Busan, Korea
4. Dong-A University Hospital, Busan, Korea