1. Department of Internal Medicine, School of Medicine, Kyungpook National University, Kyungpook National University Chilgok Hospital, Daegu 41404, Republic of Korea
2. Department of Anesthesiology and Pain Medicine, School of Medicine, Daegu Catholic University, Daegu 42472, Republic of Korea
3. Department of Anatomy, School of Medicine, Daegu Catholic University, Duryugongwon-ro 17gil, Nam-gu, Daegu 42472, Republic of Korea