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Correspondence to: Dr Heba Iskandar, Digestive Diseases Division, Department of Medicine, Emory University, 1365 Clifton Rd NE Bldg B, Atlanta, GA 30322, USA; heba.iskandar@emory.edu
HI: study design, data management, statistical analysis, manuscript writing and revision; DMG, HV, FM, MKR, KR, AA, SG, SA, MM, EM, CM, AB and NK: data collection and database entry, revision of manuscript; GS: critical revision of the manuscript and CPG: study design, study oversight, manuscript writing and critical revision.
Guarantors of the paper: HI and CPG.
Competing interests None declared.
Ethics approval Washington University in St Louis Human Research Protection Office.
Provenance and peer review Not commissioned; externally peer reviewed.
Funding HI: 5T32DK007130-36, UL1TR000448; GS: K23 DK084113.
© Article author(s) (or their employer(s) unless otherwise stated in the text of the article) 2017. All rights reserved.