bDepartments of Epidemiology and Nutrition, Harvard T.H. Chan School of Public Health, Boston, MA 02115, USA cClinical and Translational Epidemiology Unit and Division of Gastroenterology, ...

The United States is a federal republic whose people benefit from a vibrant political system, a strong rule-of-law tradition, robust freedoms of expression and religious belief, and a wide array of ...

aDepartment Medicine, Division of Gastroenterology, Schulich School of Medicine, Western University, London, ON N6A 5B6, Canada bDepartment of Epidemiology and Biostatistics, Western University, ...