1Division of Gastroenterology, University of Michigan Health System, Ann Arbor, Michigan, USA
2Center for Statistical Consultation and Research (CSCAR), University of Michigan, Ann Arbor, Michigan, USA
3Division of Internal Medicine, Columbia University, New York Presbyterian, New York, New York, USA
Correspondence: William D. Chey, MD, AGAF, FACG, FACP, Division of Gastroenterology, University of Michigan Health System, 3912 Taubman Center, SPC 5362, Ann Arbor, Michigan 48109-5362, USA. E-mail: [email protected]
Received 01 July 2014; accepted 05 January 2015
Guarantor of the article: William D. Chey, MD, AGAF, FACG, FACP.
Specific author contributions: S.B.M., and W.D.C. conceived and drafted the study. S.B.M., J.K., and A.G. collected all data. S.B.M.,W.D.C., and C.P. analyzed and interpreted data. C.P. provided statistical advice and support. S.B.M. drafted the manuscript. All authors commented on drafts of the paper. All authors have approved the final draft of the manuscript.
Financial support: This study was supported by Division of Gastroenterology, University of Michigan Health System.
Potential competing interests: William D. Chey is a consultant for Salix Pharmaceuticals. Stacy Menees, Corey Powell, Jacob Kurlander, and Akash Goel declare no conflict of interest.
