1. School of Medicine, University of Western Australia , Perth 6009 , Australia
2. Department of Cardiology, Royal Perth Hospital , 197 Wellington Street, Perth, WA 6000 , Australia
3. Department of Cardiology, Waikato District Health Board , Hamilton 3204 , New Zealand
4. School of Biomedical Sciences, Pharmacology and Toxicology, University of Western Australia , Perth 6009 , Australia
5. Department of Nuclear Medicine, Sir Charles Gairdner Hospital , Perth 6009 , Australia