1. Department of Radiology, Liverpool Heart and Chest Hospital, Thomas Dr, Liverpool L14 3PE, UK
2. School of Medicine, 30, Western Sydney University, Narellan Road & Gilchrist Drive, Campbelltown NSW 2560, Australia
3. Department of Cardiology, Westmead Hospital, Cnr Hawkesbury Road and Darcy Road Westmead NSW 2145, Australia