I am clinically trained as a physician specialized in gastroenterology and hepatology. My research has focused on clinical research of nonalcoholic fatty liver disease (NAFLD) and obesity-related gastrointestinal diseases, focusing on a population-based study. In addition, my research was not only focused on gastroenterology and was expanded to cardiology, endocrinology, and neurology (sleep medicine). I have experience with large epidemiologic cohort studies as well as clinical trials. This work has resulted in over 250 published papers, including major journals such as Gastroenterology, Hepatology, Gut, Journal of Hepatology, American Journal of Gastroenterology, etc. (as the first and corresponding author). These publications have been cited about 12,000 times.