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Contributors Data cleaning: SV and SA-M. Statistical analysis: SV and BF. SNP selection for genotyping: A Yarwood. Genotyping: KMA and EF. Study design: AB. Writing the manuscript: SV. Manuscript preparation and interpretation of the results: All authors. NOAR study lead: DPMS and AB. ERAS study lead: A Young.
Competing interests None.
Patient consent Obtained.
Ethics approval ERAS received ethical approval from the West Hertfordshire Local Research Ethics Committee and subsequently from the Caldicott Guardian. Informed consent was obtained from all patients. Ethical approval for the study was obtained (MREC 99/8/84), and informed consent was signed by all patients.
Provenance and peer review Not commissioned; externally peer reviewed.
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