1. Prevention and National Health Priorities, Public Health, Department of Human Services, Melbourne, VIC.
2. Department of Endocrinology and Diabetes, St Vincent's Hospital, Fitzroy, VIC.
3. Birth Defect Registry, Perinatal Data Collection Unit, Public Health, Department of Human Services, Melbourne, VIC.
4. Department of Obstetrics and Gynaecology, University of Melbourne, East Melbourne, VIC.
5. Maternal Fetal Medicine, Monash Medical Centre, Clayton, VIC.