1. Hematology Hospital, Seoul St. Mary’s Hospital, The Catholic University of Korea, Seoul 02706, Republic of Korea
2. Myeoma Center, Hematology Institute, Eunpyeong St. Mary’s Hospital, The Catholic University of Korea, Seoul 03312, Republic of Korea
3. Department of Hematology, Yeouido St. Mary’s Hospital, The Catholic University of Korea, Seoul 07345, Republic of Korea
4. Department of Hematology, Incheon St. Mary’s Hospital, The Catholic University of Korea, Incheon 21431, Republic of Korea