1. Duke National University of Singapore (NUS) Medical School , Singapore 169857 , Singapore
2. Department of Endocrinology, National University Health System , Singapore 119074 , Singapore
3. Department of Endocrinology, Singapore General Hospital , Singapore 169608 , Singapore
4. Department of Endocrinology, Sengkang General Hospital , Singapore 554886 , Singapore
5. Department of Endocrinology, Changi General Hospital , Singapore 529889 , Singapore
6. National Neuroscience Institute , Singapore 308433 , Singapore
7. Health Science Research Department, Changi General Hospital , Singapore 529889 , Singapore