1. Department of Obstetrics and Gynaecology Stellenbosch University and Tygerberg Academic Hospital Cape Town South Africa
2. Department of Obstetrics and Gynaecology, Amsterdam UMC Vrije Universiteit Amsterdam and Research Institute Amsterdam Reproduction & Development Amsterdam The Netherlands
3. Department of Obstetrics and Gynaecology Leiden University Medical Centre Leiden The Netherlands
4. Department of Anaesthesiology and Critical Care Stellenbosch University and Tygerberg Academic Hospital Cape Town South Africa
5. Athena Institute Vrije Universiteit Amsterdam Amsterdam The Netherlands