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Contributors Study conception and design: EM and FC. Acquisition of data: SAM and AP. Analysis and interpretation: EM, SAM, AP, SG and FC. Drafting of the manuscript: EM, SAM, AP and FC. Critical revision: EM, VQN, JK, SG and FC. Study supervision: EM, VQN, JK and FC.
Funding This work was supported by the Clinical Component of the Administrative Core of the NIH Cleveland Digestive Diseases Research Core Center (DK097948 and administrative supplement DK097948-08S1 from NIDDK and SGMRO).
Competing interests None declared.
Provenance and peer review Not commissioned; internally peer reviewed.