[1] Seoul Natl Univ Hosp, Dept Family Med, Seoul, South Korea
[2] Seoul Natl Univ Hosp, Hlth Promot Ctr, Seoul, South Korea
[3] Seoul Natl Univ, Canc Hosp, Canc Survivorship Clin, Seoul, South Korea
[4] Chungnam Natl Univ, Sch Med, Dept Radiat Oncol, Daejeon, South Korea
[5] Catholic Univ Korea, Seoul St Mary Hosp, Coll Med, Dept Internal Med, Seoul, South Korea
[6] Inha Univ, Inha Univ Hosp, Coll Med, Dept Internal Med, Incheon, South Korea
[7] Chung Ang Univ, Coll Med, Med Ctr, Dept Radiol, Seoul, South Korea
[8] Seoul Natl Univ Hosp, Dept Internal Med, Seoul, South Korea
[9] Chonnam Natl Univ, Hwasun Hosp, Sch Med, Dept Thorac & Cardiovasc Surg, Hwasun, South Korea
[10] Donga A Ilbo, Seoul, South Korea
[11] Gachon Univ, Gil Med Ctr, Dept Internal Med, Incheon, South Korea
[12] Wonkwang Univ, Coll Med, Dept Internal Med, Iksan, South Korea
[13] Yonsei Univ, Wonju Coll Med, Dept Internal Med, Wonju, South Korea
[14] Catholic Univ Korea, St Vincents Hosp, Coll Med, Dept Thorac & Cardiovasc Surg, Suwon, South Korea
[15] Kosin Univ, Coll Med, Dept Internal Med, Pusan, South Korea
[16] Konyang Univ Hosp, Dept Internal Med, Daejeon, South Korea