1. Centre for Diabetes and Endocrinology, Westmead Institute for Medical Research , Westmead, NSW 2145 , Australia
2. Westmead Hospital , Westmead, NSW 2145 , Australia
3. Department of Endocrinology, Royal North Shore Hospital , St Leonards, NSW 2065 , Australia
4. Faculty of Medicine and Health, University of Sydney , Camperdown, NSW 2050 , Australia
5. Melanoma Institute Australia, The Poche Centre , Wollstonecraft, NSW 2065 , Australia
6. Institute of Clinical Pathology and Medical Research, NSW Health Pathology , Westmead, NSW 2145 , Australia
7. Department of Medical Oncology, Royal North Shore Hospital , St Leonards, NSW 2065 , Australia