[1] Univ Oxford, Surg Sci, Oxford, England
[2] Univ Leeds, Leeds, W Yorkshire, England
[3] Univ Manchester, Manchester, Lancs, England
[4] Santersus AG, Zurich, Switzerland
[5] Univ Oxford, IBME, Oxford, England
[6] Univ Oxford, Oxford, England
[7] Royal Free Hosp NHS Trust, London, England