1 Department of Obstetrics and Gynecology, Inselspital, Bern University Hospital, Bern, Switzerland.
2 Division of Hematology and Oncology, Columbia University Irving Medical Center, New York, New York, USA.
3 OBGYN Center Gyn-Perinatal Zürich, Hirslanden Clinics, Zürich, Switzerland.
4 Department of Obstetrics and Gynecology, Trillium Health Partners and The Institute for Better Health, University of Toronto, Toronto, Ontario, Canada.
5 Division of Pediatric Hematology, Oncology, and Blood and Marrow Transplant, Nationwide Children's Hospital and The Ohio State University College of Medicine, Columbus, Ohio, USA.
6 Department of Pediatrics, Division of Hematology/Oncology, Baylor College of Medicine, Texas Children's Cancer and Hematology Center, Houston, Texas, USA.
7 Department of Pediatrics, Baylor College of Medicine, Houston, Texas, USA.
8 Department of Obstetrics and Gynecology, David Geffen School of Medicine at UCLA, Los Angeles, California, USA.