1. ANZAC Research Institute, University of Sydney , Sydney, NSW 2139 , Australia
2. Andrology Department, Concord Hospital , Sydney, NSW 2139 , Australia
3. Department of Endocrinology, Royal North Shore Hospital , St Leonards, NSW 2065 , Australia
4. Kolling Institute , St Leonards, NSW 2065 , Australia
5. Northern Clinical School, University of Sydney , Sydney, NSW 2065 , Australia
6. Sport Integrity Australia , Fyshwick, ACT 2609 , Australia
7. Diagnostic Pathology, Concord Hospital , Concord, NSW 2139 , Australia