[1] Catholic Univ Korea, Seoul St Marys Hosp, Coll Med, Hematol, Seoul, South Korea
[2] Catholic Univ Korea, Coll Med, Microbiol, Seoul, South Korea
[3] Univ Ulsan, Coll Med, Asan Med Ctr, Hematol, Seoul, South Korea
[4] Catholic Univ Korea, Coll Med, Pathol, Seoul, South Korea