Division of Gastroenterology, Massachusetts General Hospital; Boston, MA 02114

Clinical, Translational, Epidemiology Unit (CTEU), The Mongan Institute, Massachusetts General Hospital; Boston, MA 02114

Harvard TH Chan School of Public Health; Boston, MA 02115

Slone Epidemiology Center at Boston University; Boston, MA 02118

Correspondence: Hamed Khalili, MD MPH, Crohn's and Colitis Center, 165 Cambridge Street, 9 Floor. Boston, MA 02114. Email: [email protected]

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