[1] Inselsp, Univ Hosp Bern, Dept Obstet & Gynecol, Bern, Switzerland
[2] Columbia Univ, Div Hematol & Oncol, Irving Med Ctr, New York, NY USA
[3] Hirslanden Clin, OBGYN Ctr Gyn Perinatal Zurich, Zurich, Switzerland
[4] Univ Toronto, Dept Obstet & Gynecol, Trillium Hlth Partners, Toronto, ON, Canada
[5] Univ Toronto, Inst Better Hlth, Toronto, ON, Canada
[6] Nationwide Childrens Hosp, Div Pediat Hematol Oncol & Blood & Marrow Transpla, Columbus, OH USA
[7] Ohio State Univ, Coll Med, Columbus, OH USA
[8] Texas Childrens Canc & Hematol Ctr, Baylor Coll Med, Div Hematol Oncol, Dept Pediat, Houston, TX USA
[9] Baylor Coll Med, Dept Pediat, Houston, TX USA
[10] UCLA, David Geffen Sch Med, Dept Obstet & Gynecol, Los Angeles, CA USA