1. Department of Cardiology, The University of Queensland and Princess Alexandra Hospital, Ipswich Road, Wolloongabba, Brisbane 4102, Queensland, Australia
2. The James Cook University Hospital, Middlesbrough, UK
3. Menzies Research Institute Tasmania, Hobart, Australia
4. Medtronic Ltd., Hertfordshire, UK
5. Medtronic, Minneapolis, MN, USA
6. St George's Medical School, London, UK
7. The Medical School, University of Birmingham, Birmingham, UK