1. Division of Endocrine Surgery, National University Hospital Health System, Lower Kent Ridge Road, Singapore 119074, Singapore
2. Division of Surgery, Faculty of Medicine, University of Kelaniya, Thalagolla Road, Colombo P.O. Box 6, Sri Lanka
3. Department of Pathology, National University Hospital, Singapore 119074, Singapore
4. Department of Surgery, Yong Loo Lin School of Medicine, Level 8, IE Kent Ridge Road, Singapore 119228, Singapore
5. NUS Centre for Cancer Research, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 119077, Singapore