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Correction notice This article has been corrected since it published Online First. The provenance and peer review statement has been included.
Contributors Both authors wrote the manuscript.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests RCS has received research grants from Ironwood Pharmaceuticals, Zespri International and Sanofi-Aventis and lecturing fees from Menarini and Alfawasserman.
Patient and public involvement Patients and/or the public were not involved in the design, or conduct, or reporting, or dissemination plans of this research.
Provenance and peer review Commissioned; internally peer reviewed.