[1] Gyeongsang Natl Univ, Dept Internal Med, Coll Med, Chang Won, South Korea
[2] Pusan Natl Univ, Dept Internal Med, Coll Med, Busan, South Korea
[3] Yonsei Univ, Dept Internal Med, Wonju Coll Med, Kangwon, South Korea
[4] Seoul Natl Univ, Dept Internal Med, Coll Med, Seoul, South Korea
[5] Seoul Natl Univ, Dept Internal Med, Boramae Med Ctr, Seoul, South Korea
[6] Yonsei Univ, Dept Internal Med, Coll Med, Seoul, South Korea
[7] Catholic Univ Korea, Dept Internal Med, Coll Med, Seoul, South Korea
[8] Kyungpook Natl Univ, Dept Internal Med, Sch Med, Daegu, South Korea
[9] Chosun Univ Hosp, Dept Internal Med, Gwangju, South Korea
[10] Hallym Univ, Dept Internal Med, Sacred Heart Hosp, Pyongchon, South Korea
[11] Gachon Univ, Gil Hosp, Dept Internal Med, Incheon, South Korea
[12] Dongguk Univ, Dept Internal Med, Med Ctr, Goyang, South Korea
[13] Sanofi Aventis Korea, Dept Med, Seoul, South Korea