1. Department of Medicine, University of Western Sydney, Sydney, New South Wales, Australia
2. Department of Medicine, Campbelltown Hospital, Campbelltown, Australia
3. Sydney Medical School, University of Sydney, Sydney, New South Wales, Australia
4. Australian School of Advanced Medicine, Macquarie University, Macquarie Park, New South Wales, Australia
5. Nycomed ANZ, North Ryde, Australia Funded by Nycomed ANZ, North Ryde, Australia