1. Department of Medicine, Sutherland Hospital, Caringbah, Sydney, New South Wales 2229, Australia.
2. Present address: Radiology Department, South Side Cancer Care Centre, Sydney, New South Wales, Australia.
3. Department of Radiology, John Hunter Hospital, New Lambton Heights, New South Wales, Australia.
4. Department of Urology, St. George Hospital, Kogarah, New South Wales, Australia.
5. Waratah Private Hospital, Hurstville, New South Wales, Australia.
6. Douglass Hanly Moir Pathology, Macquarie University, Macquarie Park, New South Wales, Australia.