[1] Kyungpook Natl Univ Hosp, Taegu, South Korea
[2] Busan Natl Univ Hosp, Pusan, South Korea
[3] Pusan Natl Univ, Sch Med, Pusan Natl Univ Hosp, Dept Hematol Oncol, Pusan, South Korea
[4] Chungnam Natl Univ, Coll Med, Dept Internal Med, Taejon, South Korea
[5] Chonnam Natl Univ, Sch Med, Jeollanam Do, South Korea
[6] Chonnam Univ Hosp, Kwangju, South Korea
[7] Daegu Catholic Univ, Sch Med, Dept Internal Med, Taegu, South Korea
[8] Natl Canc Ctr Korea, Dept Internal Med, Goyang, South Korea
[9] Kosin Univ, Coll Med, Dept Internal Med, Pusan, South Korea
[10] Inje Univ, Coll Med, Busan Paik Hosp, Pusan, South Korea
[11] Soon Chun Hyang Univ Hosp, Seoul, South Korea
[12] Wonkwang Univ, Sch Med, Dept Internal Med, Iksan, South Korea
[13] Yeungnam Univ, Coll Med, Taegu, South Korea
[14] Yeungnam Univ, Med Ctr, Dept Internal Med, Taegu, South Korea