1. Department of Obstetrics & Gynaecology Windhoek Central Hospital Windhoek Namibia
2. Department of Obstetrics and Gynaecology Leiden The Netherlands
3. Department of Cardiology Windhoek Central Hospital Windhoek Namibia
4. Athena Institute VU University Amsterdam The Netherlands
5. Department of Health Sciences University Medical Center Groningen Groningen The Netherlands
6. Department of Obstetrics and Gynaecology Medical Center Leeuwarden Leeuwarden The Netherlands