1. Department of Internal Medicine, School of Medicine, Yeungnam University, Daegu, Korea
2. Department of Internal Medicine, School of Medicine, Dongsan Medical Center, Keimyung University, Daegu, Korea
3. Department of Obstetrics and Gynecology, School of Medicine, Dongsan Medical Center, Keimyung University, Daegu, Korea
4. Department of Pathology, School of Medicine, Dongsan Medical Center, Keimyung University, Daegu, Korea