Korea University - College of Medicine, Yonsei University - College of Medicine, Korea University - Department of Internal Medicine, Korea University - Department of Internal Medicine, Sungkyunkwan University - Samsung Advanced Institute of Health Sciences and Technology (SAIHST), Korea University - College of Medicine, Korea University - College of Medicine, Korea University - Department of Internal Medicine, University of Ottawa - Ottawa Hospital Research Institute, University of Ottawa - Department of Psychiatry, Yonsei University - Department of Pediatrics, Korea University - Department of Internal Medicine and Cleveland Clinic - Bariatric and Metabolic Institute