1Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
2Internal Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University, School of Medicine, Seoul, South Korea
3Internal Medicine, Korea University Medical Center, Guro Hospital, Seoul, South Korea
4Internal Medicine,, Dankook University College of Medicine, Cheonan, South Korea
5Department of Internal Medicine, Hallym Medical Center, Hallym University College of Medicine, Seoul, South Korea
6Department of Internal Medicine, Dong-A University College of Medicine, Busan, South Korea
7Soon Chun Hyang University Hospital, Seoul, South Korea
8Department of Internal Medicine, Yonsei University College of Medicine, Seoul, South Korea
9Internal Medicine, Yeungnam University College of Medicine, Daegu, South Korea
10Korea Cancer Center Hospital, Seoul, South Korea
11Department of Internal Medicine, Ewha Womans University School of Medicine, Seoul, South Korea
12Department of Internal medicine, Chonbuk National University Hospital, Jeonju, South Korea
13Department of Internal Medicine, Jeju University College of Medicine, Jeju, South Korea
14Division of Hematology/Oncology, Gachon University Gil Hospital, Gachon University of Medcine and Science, Incheon, South Korea
15Hematology-Oncology, Hallym Medical Center, Hallym University College of Medicine, Anyang city, South Korea
16Department of Medicine, Chung-Ang University Young San Hospital, Seoul, South Korea
17Medicine, Samsung Medical Center, Seoul, South Korea
18Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea