1. The Research Institute for Nursing Science College of Nursing Keimyung University Daegu Korea
2. Department of Otolaryngology‐Head and Neck Surgery College of Medicine The Catholic University of Korea Seoul Korea
3. Department of Otolaryngology‐Head and Neck Surgery Seoul St. Mary’s hospital Seoul Korea
4. Medical Library The Catholic University of Korea Seoul Republic of Korea
5. Department of Otolaryngology‐Head and Neck Surgery Uijeongbu St Mary's Hospital Uijeongbu City Korea