1. Department of Gastroenterology, CHA Bundang Medical Center CHA University Seongnam‐si South Korea
2. Asan Liver Center, Asan Medical Center University of Ulsan College of Medicine Seoul South Korea
3. Division of Gastroenterology and Hepatology, Department of Internal Medicine, College of Medicine The Catholic University of Korea Seoul South Korea
4. Department of Biostatistics Korea University College of Medicine Seoul South Korea