1. Department of Radiology, Duke University Medical Center, Durham, North Carolina, USA
2. Department of Radiation Oncology, Duke University Medical Center, Durham, North Carolina, USA
3. Department of Radiology, Royal Melbourne Hospital, Parkville, Australia
4. Department of Medicine, Dentistry and Health Sciences, University of Melbourne, Parkville, Australia
5. Department of Radiology, Alfred Hospital, Melbourne, Australia
6. Section of Endocrine Surgery, Department of Surgery, Duke University Medical Center, Durham, North Carolina, USA