Department of Medicine;
Division of Gastroenterology and Hepatology;
Johns Hopkins University;
Guangdong provincial Key Laboratory of Colorectal and Pelvic Floor Diseases;
the Sixth Affiliated Hospital of Sun Yat-sen University;
Department of Gastroenterology;
the Sixth Affiliated Hospital of Sun Yat-sen University;
Department of Medicine;
Med Star Health Internal Medicine;
Department of Health and Sport Sciences;
Federal University of Acre;
Department of Medicine;
Faculty of Medicine and Health Sciences;
An-Najah National University;
Ravindra Nath Tagore Medical College;
St Vincent Hospital;
Department of Epidemiology;
Johns Hopkins University Bloomberg School of Public Health;
Crohn’s disease; Family history; Disease outcome; Inflammatory bowel disease; Epidemiology; genetics; Environment; Medication; Surgery;