[1] Ewha Womans Univ, Mokdong Hosp, Dept Internal Med GI Hepatol, Seoul, South Korea
[2] Ewha Womans Univ, Mokdong Hosp, Dept Prevent Med, Seoul, South Korea
[3] Natl Evidence Based Healthcare Collaborating Agcy, Seoul, South Korea
[4] Bundang CHA, Dept Internal Med GI Hepatol, Seongnam, South Korea
[5] Kwandong Univ, Coll Med, Dept Internal Med GI Hepatol, Incheon, South Korea
[6] Natl Canc Ctr, Dept Internal Med GI Hepatol, Goyang, South Korea
[7] Natl Canc Ctr, Dept Prevent Med, Goyang, South Korea