1Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan, USA
2Department of Gastroenterology, Mayo Clinic, Rochester, Minnesota, USA
Correspondence: Peter DR Higgins, MD, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan, USA. E-mail: email@example.com
Guarantor of the article: Peter D.R. Higgins, MD.
Specific author contributions: Outline, half of draft, final edits: Peter D.R. Higgins; consultation on outline, half of draft, endnote library and references: Joel G. Fletcher.
Financial support: None.
Potential competing interests: None.