1. The East Anglian Centre for Fetal Medicine; Norfolk and Norwich University College Hospitals Foundation Trust; Norwich UK
2. Fetal Medicine Unit, Elizabeth Garrett Anderson Wing; University College London Hospitals NHS Foundation Trust; London UK
3. Department of Gynaecological Ultrasound, Elizabeth Garrett Anderson Wing; University College London Hospitals NHS Foundation Trust; London UK
4. Department of Obstetrics & Gynaecology, Women and Children Health Complex; University Malaya Medical Centre; Kuala Lumpur Malaysia