[1] Univ East Anglia, Sch Med, Norwich, Norfolk, England
[2] Lunenfeld Tanenbaum Res Inst, Toronto, ON, Canada
[3] Univ Toronto, Med, Toronto, ON, Canada
[4] Sunnybrook Res Inst, Med, Toronto, ON, Canada
[5] Medtronic, Market Access, Tolochenza, Switzerland
[6] Medtronic, Hlth Econ, London, England