1. Department of Cardiology, Hull York Medical School, Hull and East Yorkshire Medical Research and Teaching Centre; Castle Hill Hospital; Cottingham Kingston upon Hull UK
2. Philips Research; Eindhoven The Netherlands
3. Department of Electrical Engineering; Eindhoven University of Technology; Eindhoven The Netherlands
4. National Heart & Lung Institute and National Institute of Health Research, Cardiovascular Biomedical Research Unit, Royal Brompton & Harefield Hospitals, Imperial College; London UK