Protocol for the Arterial Revascularisation Trial (ART). A randomised trial to compare survival following bilateral versus single internal mammary grafting in coronary revascularisation [ISRCTN46552265].

"Competing interests The author(s) declare that they have no competing interests."

"AcknowledgementsJill Mollison and Ed Juszczak for statistical support – funded by ART study grant and NHS R&DOliver Rivero-Arias and Andrew Briggs for health economic analysis – funded by ART study grant and University of OxfordFiona Nugara for data management – funded by ART study grant and Royal Brompton HospitalPauline Newlands for database design – funded by ART study grant and Royal Brompton Hospital ART is funded jointly by a grant from the British Heart Foundation (SP/03/001) and a grant from the Medical Research Council (G0200390). The BHF and MRC peer-reviewed the grant application and have approved the manuscript submission. Source of funding for authors"