1. Department of Internal Medicine, Keimyung University Dongsan Medical Center, Daegu, Korea
2. Center for Pancreatobiliary Tumor, Kyungpook National University Chilgok Hospital, Daegu, Korea
3. Department of Internal Medicine, School of Medicine, Kyungpook National University, Daegu, Korea
4. Department of Internal Medicine, Yeungnam University Medical Center, Daegu, Korea
5. Department of Internal Medicine, Daegu Fatima Hospital, Daegu, Korea
6. Department of Internal Medicine, Daegu Catholic University Medical Center, Daegu, Korea
7. Department of Internal Medicine, Inje University College of Medicine, Busan, Korea