1 Division of Neuroradiology and Musculoskeletal Radiology, Department of Radiology, Medical University of Vienna, Vienna, Austria.
2 Division of Ultrasound in Obstetrics & Gynecology, Lis Maternity Hospital, Sourasky Medical Center and Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
3 University of Texas Southwestern Medical Center, Dallas, TX, USA.
4 Department of Child Health, Obstetrics & Gynaecology, School of Medicine, University of Nottingham and Nurture Fertility, The Fertility Partnership, Nottingham, UK.