Affiliation: | a Department of Obstetrics and Gynecology, University of Toronto, The Hospital for Sick Children, Toronto, Ontario, Canada b Department on Obstetritics/Gynecology, Maryland General Hospital, Baltimore, Maryland c Mount Sinai Hospital, Toronto, Ontario, Canada d St. Michael's Hospital, Toronto, Ontario, Canada e Department of Obstetrics and Gynecology and Reproductive Sciences, University of California, San Francisco, San Francisco General Hospital, San Francisco, California |