1. Liggins Institute, University of Auckland , Auckland 1142 , New Zealand
2. Department of Radiology, Auckland Radiology Group , Auckland 1050 , New Zealand
3. Department of Obstetrics and Gynecology, Robinson Research Institute, University of Adelaide , Adelaide, South Australia 5006 , Australia
4. Department of Reproductive Endocrinology and Fertility, Repromed Auckland and Auckland Gynecology Group , Auckland 1050 , New Zealand
5. Department of Endocrinology, Greenlane Clinical Centre, Auckland District Health Board , Auckland 1051 , New Zealand
6. Department of Paediatrics: Child and Youth Health, Faculty of Medical and Health Sciences, University of Auckland , Auckland 1023 , New Zealand