Department of Gastroenterology and Hepatology;
Soonchunhyang University school of Medicine;
Bucheon 14584;
South Korea;
Department of Internal Medicine and Liver Research Institute;
Seoul National University College of Medicine;
Seoul 03080;
South Korea;
Department of Biostatistics;
Clinical Trial Center;
Soonchunhyang University Bucheon Hospital;
Bucheon 14584;
South Korea;